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iFi Audio xDSD

  • xDSD-EN-01.jpg

    The xDSD DAC is the latest iFi statement in advanced, affordable, portable audio. Its dark titanium vacuum ion plated metal enclosure is pleasingly tactile and compact. The radio-frequency transparent end cap allows full CD-wireless music transmission.

    It delivers for music lovers and audiophiles alike.

    First, it delivers CD-quality Bluetooth connectivity for Apple/Android to stream the latest music on iTunes, Apple Music, Spotify, Tidal and any other streaming platforms.

    Second, it delivers the very highest quality PCM768/DSD512 and MQA formats for downloaded and Tidal streamed music in full studio-quality.

    Third, with the iFi analogue signal processing circuitry and the original S-Balanced amplification stage, it delivers pure musical enjoyment to in-ear-monitors or headphones.

    The xDSD, a new level of musical experience for your headphones, on-the-go.


    High-End Wireless On-the-Go, Ultimate wired performance
    Deliver CD-Quality music wirelessly to your headphones from smartphone (Apple iPhone or Android), DAP (Apple iPOD and similar), laptop or smart TV.

    AAC and aptX enabled Bluetooth raises sound quality to CD levels compared to the below MP3 levels SBC codec (voice-quality only) found in basic Bluetooth products.

    Imagine the xDSD in your pocket driving your headphones while you are surfing on your phone and enjoying Ed Sheeran in the highest quality!

    Wired, the USB type A OTG/CCK connector offers the ultimate High-Res audio performance for smartphones, laptops and USB enabled DAPs with 22.57MHz* DSD and 768kHz/32Bit* PCM.

    The 3.5mm coaxial/TOSLINK combo S/PDIF input gives older DAPs and disk players a new lease of life as a transport to serve the xDSD with 192kHz/24Bit* full High-Resolution Audio.

    * up to these format levels

    MultiBit means Musicality
    Headphone listening is often tiring and causes listener fatigue.

    Not with the xDSD. Time flies by and the listener is immersed in the music. The ‘pluck’ of a guitar can be discerned. A Steinway piano sounds ‘woody’ instead of ‘glassy’ like an electronic keyboard.

    To deliver a truly musical performance every technical aspect must be present and correct. From the Burr-Brown multibit DSD1793 DAC Chipset to deliver a realistic, musical sound to the femto precision GMT Clock and intelligent memory buffer system derived from AMR Audio’s USD5,500 flagship DAC products to eliminate jitter. The xDSD is packed with the technology it takes.

    Perfected for MQA or non-MQA
    Tidal with MQA is defining the future of High-Resolution streaming audio. Ready for MQA out of the box, the xDSD also supports beyond full High-Res Audio with 11.289MHz DSD and 384kHz/32Bit PCM. Simply connect to Tidal (on computer) and check the options to stream MQA ‘like the artist intended’ as the MQA team say.

    We also offer an alternative firmware that is optimised for ultra-high resolution audio and which unlocks 22.57MHz DSD and 768kHz/32Bit PCM#. This can be easily downloaded from our website and applied to the xDSD.

    # With this firmware MQA is not supported

    S-Balanced. Just plug-in and enjoy.
    Most premium headphones now include an option for balanced wiring. Balanced wiring is better because it eliminates distortion and crosstalk introduced by the classic unbalanced 3-contact connection that shares the ground return wire and jack connection between channels.

    The iFi exclusive S-Balanced technology delivers the maximum performance from single-ended and balanced headphones alike. Compared to standard balanced circuitry, noise and distortion are lowered by up to 3-fold (9dB). Even with non-balanced headphones crosstalk and related distortion are reduced by 50%.

    Compatibility for both balanced/unbalanced headphones is straightforward and super user-friendly. Just plug-in and enjoy the music – with live recordings, the xDSD brings out the spaciousness of the concert hall or the intimacy of the jazz club.

    Studio sound with 3D+ Matrix and XBass+
    You should hear music as if you are in the studio during the final cut. The 3D+ Matrix and XBass+ system help deliver the true musical performance as heard in the studio to your headphones.

    Most recordings are made for speakers (not headphones). This produces what is technically known as ‘in-head localisation’, as if the music plays inside your head. Which is unnatural and frankly obnoxious. The analogue-signal based 3D+ circuit restores the correct sense of placement that the artist is in the room and outside your head.

    Many otherwise excellent and expensive open back headphones lack low bass. XBass+ restores deep, clean and tight bass and puts the ‘meat’ back into the music, without muddying up the midrange – now EDM or Drum & Bass as they should do, really plumb the depths of the bass notes.

    Hear your music as the artists intended.

    Pure Line Out mode for ultra-fi
    Whether at home or in the car, the Line Out mode means the volume control, 3D+ Matrix and X-Bass+ are bypassed and the output stage is configured specifically for the best line operation, avoiding ‘double-amping’.

    The xDSD delivers the musical goods when used with expensive ultra-fidelity home or car audio systems. The more expensive the system, the better the xDSD is able to demonstrate its sonic attributes.

    Cyberdrive amplifier design for lowest noise
    Got difficult to drive over-ear headphones? No sweat. The xDSD can drive them to eardrum splitting levels (although not recommended!). Have super sensitive in-ear-monitors that show up noise from all sources? With the xDSD silence reigns supreme.

    The Cyberdrive headphone amplifier stage is one of the pivotal new circuit designs in the x-series. This new design places all parameters of the fully analogue system under digital control for a ‘best of both worlds’ scenario. The Cyberdrive design incorporates the iFi exclusive OV4627 ultra low noise FET input Op-Amp and W990VST digitally controlled stepped attenuator to deliver a new level of sound-quality.

    From lowest noise for IEMs to extreme drive levels: no need to switch anything! Just set the volume control as desired and let Cyberdrive do the rest.

    New Cyberdrive System
    Nothing is worse than running out of juice in the middle of your favourite tune. The xDSD uses a separate power input (micro USB) for unlimited compatibility with smartphones and no extra power draw from the smartphone’s battery reducing your phone’s up-time. And it packs a battery to keep your music playing.

    The new 3.8V/2,200mAh Lithium Polymer battery offers 12% greater actual capacity in the same size package. Depending on the headphones and the connection used, playback times of up to 10 hours for S/PDIF, 8 hours for Bluetooth and 6 hours for USB are achieved.

Recent Reviews

  1. Johnny Mac
    iFi Audio xDSD Realview.
    Written by Johnny Mac
    Published Apr 1, 2019
    Pros - Compact and unique design, dark background, great BT implementation, multitude of connectivity options.
    Cons - Lack of BT5.0 and LDAC support, no OTG cable out of the box.
    It’s common knowledge to everyone that the “i” in iPhone stands for Internet which is perfect for its brand which allows its users to interact seamlessly with the Internet. I then found myself interacting and checking out iFi Audio, a UK-based electronics company launched in 2012 with a vision of improving sound quality and eradicating distortion, noise and hiss from different audio equipment.

    iFi Audio has since been a staple in audio setups, thanks to their line of DACs, AMPs, AC and DC purifiers and a lot more, all designed to give an “improved” sound. I first got a taste of their tech when a friend of mine brought the iFi micro iDSD Black Label which made me a fan then and there of iFi Audio with how the micro iDSD Black Label tackled the trio of cans lying around that time, the Audeze EL-8, Hifiman 4xx and the ATH-M70x. Fast forward a year later and now, I finally get to be in bed with one of iFi Audio’s newer offerings, the iFi xDSD. iFi Audio via their exclusive Thailand distributor, ProPlugin, sent me the review unit. If you’re visiting Thailand, I highly recommend checking out ProPlugin since they not only carry iFi Audio’s products but also a vast collection of audio solutions.

    The iFi xDSD is iFi Audio's ultimate portable DAC/AMP solution for audiophiles and music lovers that just can’t live without their tunes. The iFi xDSD is spec’d out with the Burr Brown multibit DSD1793 DAC chip, XMOS-based USB circuitry, W990VST and quad J-Fet OV4627A op amps, zero-jitter operation via AMR (Abbingdon Music Research, iFi Audio’s sister company) Global Master Timing clock, re-clocking and data management, aptX and AAC BT support, S-Balanced technology, Cyberdrive headphone amplifier stage and their trusted and upgraded 3D-Matrix+ and XBass+ technologies. That’s typically the most feature packed DAC/AMP featured in my young but growing realview journey. I was already a fan of the 3D-Holographic+ tech and hearing this Matrix iteration is keeping me a fan, this just acts as an appetizer of yet to come from the iFi team.
    The iFi xDSD is priced currently at $399 and ฿15,900 over at ProPlugin’s website. The iFi xDSD presents itself as a premium solution for both wired and wireless use as well as a portable and desktop use audio solution. It is smacked right in the middle with its notable peers around such price bracket like the Oriolus BA300S, Cozoy REI, Shozy Magic and the Fanmusic BL-2. Each boasting and parading its own set of features. Given that the xDSD is made by iFI Audio. Could it be that not only does it X’s out its competition but also give credit to my assumption that the “i” in iFi Audio stands for “improve” thus resulting in improved Fidelity? Let’s stop the assumptions here on out and check the out the xDSD.

    Specifications and Packaging

    iFi xDSD Spec sheet:

    • USB Input:up to PCM768kHz & DSD51(24.6/22.6MHz)
    • S/PDIF Coaxial and Optical Input:up to 192kHz/24Bit
    • Dynamic Range:> 113dB (A)
    • Volume Control:-101dB…0dB in 1dB steps
    • Output power:> 2.82V/500 mW @ 16 Ohm
      • 3.7V/270mW @ 50 Ohm
      • 3.8V/48 mW @ 300 Ohm
      • 3.8V/24 mW @ 600 Ohm
    • Line out Level:> 2.1V @ 0dBFS (& 0dB Volume)
    • THD &N (1V/16R):< 0.005%
    • Output Impedance:< 1 Ohm
    • Battery:3.8V/2200mAh
    • Dimensions:95 (l) x66.5 (w) x19 (h) mm
    • Weight:127g (0.28 Ibs)
    The iFi xDSD came enclosed in white rectangular box adorned with all the unique iFi Audio technologies that they have integrated into the xDSD. Opening the box will show the xDSD enclosed in a matte plastic sheet which I felt was treated as it doesn’t stick to the uber shiny chrome finish of the xDSD, my review unit was a demo one so it lacks some minor accessories notably the black velvet pouch and the USB data cable. The rest of the accessories included are as follows:
    • USB-A to USB-B adapter
    • USB-A to USB-B cable
    • 3.5mm Optical adapter
    • 2 sets of Velcro strips
    • Warranty and Manual card
    This particular accessory set is great and hits all the necessary cables needed for a connection to any source you’d need to pair the xDSD with, an OTG cable as a bonus would have been great. I would have loved to get to try the storage pouch since the xDSD’s chrome finish is a fingerprint magnet and see if the pouch is velvet-lined in the interior as well for those nagging fingerprints.

    Build quality, Interfaces and Handling
    The 1st time that I held the xDSD was a joy, its zen inspired contours allows for a well-managed grip not to mention that the back panel is a matte black plastic which transitions well with the glossy chrome finish. The 4 built-in corner rubber feets on the underside was also great since I wouldn’t want myself to be the one to install such and have the adhesives coming loose in time and not to mention that it’s black, perfectly matching the back panel and all the other body connections which are all black. The 4 visible allen screws are tempting to open (care to suggest if this needs any internal upgrades or so?) as well.

    Front Panel
    The xDSD’s front panel houses its signature round volume control knob/button which also doubles as the power switch. A long press on the translucent round button which also shows the iFi logo will turn on the xDSD and can cycle between wired (green illumination) and wireless (blue illumination) connection, the cycle can last at around 20 seconds before it turns off again.

    This same power switch which also acts as the volume knob which is pure analogue and would light up in various colors depending on the volume level. A mute function is also embedded on this same button once playback is present on the xDSD and is indicated by a blinking red and the current volume light indicator.

    There is also an input indicator LED besides the volume/power knob. The usual red/blue cycle is indicating a wireless BT connection pairing is in progress which stays blue when wireless BT connection is established. This same indicator stays on green when wired connection is established, be it S/PDIF or USB input. An Audio Format LED is also present above the input indicator LED. The other 2 indicator LEDs are for the iFi Audio 3D-Matrix+ and XBass+ tech, basic operations here, a white LED appears when this 2 functions are used.

    Also in the front panel is the trademark S-Balanced headphone 3.5mm/Line Output port which utilizes and maximizes 3.5mm TRRS/TRS connection while also being able to work with the standard non-balanced 3.5mm connection. The xCAN features the 2.5mm balanced out which is far more common as a balanced port, I guess the 4.4mm pentaconn balanced port will be saved for the xDSD’s upcoming big brother.

    Back Panel
    The xDSD’s back panel is as feature rich as its front panel, safe to say the xDSD could take you front or back and you’d have fun. The 1st port is the S/PDIF input followed by a USB-A input, this is where we will be missing the OTG cable which wasn’t supplied in the accessory set like what the Audirect Beam and Zorloo ZuperDAC-S did, I guess a missing OTG cable is the thing.

    Another iFi Audio proprietary tech is its digital filter between “Measure” and “Listen”. By the naming scheme itself, the “Measure” filter is a frequency optimized filter for critical listening and for those graph-guys which I am not. I’m a “Listen” type of a guy and so are my realviews, I’d be leaving the measurements towards my fellow exceptional technical reviewer peers.
    The final port on the xDSD’s back panel is the micro USB charging port which is purely made for charging and avoids further power draw by allowing their new Cyberdrive tech have full control over this port yet I would still prefer that they integrate and opt for a type C port because right now, only my main camera isn’t under type C so the xDSD isn’t thinking ahead in this aspect.

    Connectivity and Stability
    The xDSD’s S-Balanced/Lineout port is a versatile port which I would have personally liked how all balanced out ports should have been all along and not by going through the 2.5mm connection sysetm which although has its perks (sound-wise but not build-wise), I’m personally not a fan of. The 4.4mm pentaconn balanced connection is another story though. The S-Balanced/Lineout port works great and as advertised.
    Speaking of DAPs and DACs, the xDSD ergonomically stacks well with most of my portable DAPs when the DAC/AMP function is used. The xDSD’s silhouette is great for this due to its almost phone-like width as well as its 4 installed rubber feets, this is where the included Velcro strips comes to play as well. The xDSD’s Burr-Brown PCM1793 Multibit DAC chip supports PCM768kHz & DSD512 at 24.6/22.6MHz, xDSD also got the TIDAL users back with its support for MQA tracks (88.2/96/176.4/192kHz). Its DAC function via my MSI GF62 8RE via Foobar2000 v1.4 performs great too with no hiccups as advertised.
    Bluetooth connectivity is stuck at the almost ancient BT4.0, ancient in iFi Audio standards since basically, the tech that they have incorporated on the xDSD warrants that this should then and there support BT5.0. One thing is notable though about how iFi Audio implemented the BT4.0 output pathway for the xDSD, instead of the usual cookie cutter route used by the majority of BT output functionality, iFi Audio decided to route the forthcoming BT output signal towards the Burr-Brown DAC chip to ensure that you get that iFi Audio quality sound.

    Sound Quality and Battery Life

    The xDSD packs a 3.8V/2200mAh battery devoid of quick charge capability. I’ve used the xDSD mainly connected via USB off my laptop with a mix of 16/44 and 14/96 FLAC files and it easily lasts approximately 8-9 hours with a little noticeable warming on its aluminum body. BT use via my OnePlus3T device lasted roughly the same time (8-9 hours) as well with no dropouts of connection and with a great reliability and stability be it when inside my backpack or my jeans, stationary or mobile. The choice of having a dedicated charging port was also convenient especially in relation to my lifestyle which I have grouped my electronic devices which needs charging at a specific time and have them all charged unused as well as when used. I would however refrain from using the xDSD when charging as it gets way warmer than it should be which isn’t the best circumstances especially if you want to extend the xDSD’s lifespan. I would however doubt that since we audiophiles are mostly going to upgrade our stuff every once in a while.

    That’s it, it’s the end of this realview. Oh yeah, almost forgot that we are here to talk about sound! It’s easy to be caught astray in checking all the cool stuff packed inside the xDSD that some would focus on the specifications more rather than giving this miniscule beast an actual listen. The iFI xDSD is damn dead silent and hiss absent on all my entry level IEMs (BGVP DM6, Magaosi K5 v2 and Whizzer Kylin) and some mid-tier IEMs (Custom Art FIBAE Black, Hisenior T4 and UFOEAR UFO-112) as well mid-tier full-sized cans (ATH AD900x and Sony MDR-CD900st)

    The xDSD wired sound was tested with the Hisenior T4 which showcases an overall warm tonal ability along with MJ’s Thriller album in 16/44 FLAC(S/PDIF, xDuoo X10Tii) and via my MSI GF628RE laptop (USB, Foobar2000 v1.4). The xDSD gave out an overall engaging and lively tonal ability which rendered the Hisenior T4 more enjoyable with the low-end gaining a much controlled impact. The complimentary effect of the already dark sounding background of the T4 with the xDSD’s dead silent background allowed the midrange and upper midrange tones to transition with authority. The upper frequencies is where the xDSD likes to retain the IEM’s inherent ability while it cleans the low-end and enhances the midrange.

    I’ve been pampered with LDAC use via my Sony CAS-1 and with the xDSD’s BT4.2 specification, my hopes weren’t high although the xDSD’s portability is taken into consideration. The BT sound of the xDSD sounded way better than what my other music players (xDuoo X3ii and xDuoo x10Tii) was able to offer, the better being defined as giving the overall sound more full-bodied and resolving with respective frequencies being right on timbre. The LDAC’s function on the Sony CAS-1 still trumps the iFi xDSD with how dark the background was yet it’s safe to say that the mid-level expectation I had with the xDSD’s BT sound was exceeded. The “Measure and Listen” filters exhibited miniscule sound signature changes with only a touch of micro detail clarity and retrieval as its main observable effects, I personally preferred the “Listen” filter.

    With a name that already screams DSD in your face paired with a $399 price tag, iFi Audio’s xDSD needed to not only needs to meet high expectations but also surpass them at a high degree. Packed with a multitude of features which are completely absent in competing brands such as their 3D-Matrix+ and XBass+ tech as well as parading Cyberdrive power management platforms and S-Balanced tech made the xDSD's $199 in its price tag justifiable, the rest of the price tag can be attributed to the clean and balanced sound with ample power to make some headphones sing along with the premium aluminum aesthetic silhouette of the xDSD. The single key point of interest that tickles a potential xDSD buyer is the lack of LDAC and BT5.0/5.1 support which would have made the xDSD an almost complete portable DAC/AMP (2.5mm and 4.4mm balanced outputs says Hi).

    Yet even with a lack of LDAC/ BT5.0/5.1 support, the xDSD was able to trounce my other portable BT devices and with great stability to boot which made that key point almost just a technical and numbers issue rather an actual real life complaint.

    For the all the times that I used the iFi xDSD, it clearly made sense that the “i” in iFi Audio means improved. It’s safe to say that I love the iFi xDSD while only liking its price.
      dcime, Grimbles and RockStar2005 like this.
  2. upsguys88
    The BURR-fect Ifi xDSD!
    Written by upsguys88
    Published Feb 3, 2019
    Pros - Lightweight
    Easy connections (wired/Bluetooth)
    Fast and clean Bluetooth connection
    Amazing sound
    HIgh quality and natural sounding DAC
    Cons - Could have had USB-C (like XCan instead of Micro usb)
    • Let me start by saying this little gear has it all! It is BURR-fect! I am a teacher and am on the go all time whether it's a trip to the copy room, an hour of planning time, or moving from coffee shop to coffee shop to grade papers for my kiddos, I use this. It is extremely light, easy to velcro to the back of my iPhone SE and can connect wired (my traditionalist choice) or Bluetooth, it produces clean powerful sound.

    I am not what you would call a bonafide audiophile, but I love listening to great music, with the best gear! I am going to compare this to my Centrance BlueDac, LH Labs V2+ Infinity, and Mojo. The comparison comes with my priority of using gear focused on portability, ease of use, sound quality, price, and weight.

    Portability/Ease of Use:
    This dac/amp is extremely portable, very much like a shrunk down Ifi IDSD BL in the palm of your hands minus the RCA output. I use the included velcro to attach my iPhone and it does not add much weight, size or bulk. I can stick it in my pocket, attach the apple cck and off I go. Using Bluetooth is a sinch as well. Once the Ifi xDSD is first connected via Bluetooth to your source, it will auto connect every time after this initial connection. With my Bluedac, connected to my phone via velcro and Bluetooth, it would produce the LTE phone signal buzz which basically made what Centrance called a wired or Bluetooth dac/amp, only a Bluetooth amp. This was frustrating so I was looking for its replacement soon after. This replacement came in the form of the Ifi xDSD which has zero hiss if you want to use its Bluetooth connection while being physically attached to a phone. This was a huge plus, as the chassis has a plastic bottom that allows for a clear signal path between Bluetooth components without sacrificing build quality (which the bluedac did with its 3D printed chassis that broke on me 3 times!). Overall, this kit is extremely portable and easy to use with its nice buttons, simple directions and multiple input/output options.

    Sound Quality:
    The Ifi xDSD sound is amazing. I love the BurrBrown Dac implementation as it provided all of my headphones (6xx, AudioQuest nighthawk, V-Moda M100, and Audeze iSine20) with enough power, depth, soundstage, and clarity. The sound is much like the mojo, but with a touch less warmth, but with more connection options and better battery life. I really enjoyed its sound. The Ifi xDSD provides the clear, punchy (x-bass) bass and wide soundstage (3D) options that are a nice addition for those wanting some extra options for their variety of cans. I truly enjoy its sound and have made it my everyday, go-to amp/dac for streaming tidal and playing hi-res files on my Hiby music player app.

    The price for such a quality, usable and versatile amp/dac speaks for itself. I demoed the Fiio Q5 and while it has a nice option for changing of amps, I much prefer the Ifi xDSD for the price because of the sound, and it's super lightweight. This is a steal for such an advanced portable amp/dac of which I highly recommend for anyone who wants all the bells and whistles in a tiny form factor with Bluetooth.

    Ifi XDSD + XCan:
    Not only is the XDSD amazing on its own, if you are the person who needs just a bit more power for your Hifiman HE-6 or those high impedance cans that crave as much power as they can stomach, then ifi allows the monstrous, balanced, power of the XCan to suit your needs. I played around with using the 3.5 to 3.5 connector supplied in the XDSD accessories box to connect the XDSD and XCAN together to see what their capability was as a pair. The result was a booming, clean, simple set up that brings the best out of the Ifi xDSD's BurrBrown dac through to the addition of the XCAN's truly amazing power. The Ifi xCAN's pure power in addition to the Ifi xDSD's wonderfully implemented BurrBrown analog-like sounding dac is a tiny form factor desktop quality stack!

    In conclusion, the Ifi xDSD is my portable amp/dac of choice of all on the market right now for the myriad of reasons stated in my review. All I can say now it go and enjoy it!
    1. RockStar2005
      Great review ups!!
      RockStar2005, Feb 3, 2019
      upsguys88 likes this.
    2. audiomonkey777
      Contemplating the xDSD - already have iFi's nano BL. Nice review - thanks.
      audiomonkey777, Sep 13, 2019
      upsguys88 likes this.
  3. Dobrescu George
    iFi xDSD DAC/AMP Review - The Prodigy
    Written by Dobrescu George
    Published Dec 3, 2018
    Pros - + Clear Sound
    + Good Dynamics
    + Wide Soundstage
    + Good Build Quality
    + Fairly Good Battery Life
    + Stylish and polished design
    + Works with everything, with no issues
    + Lots of Power
    + Very Portable
    + Fun overall device
    Cons - - Fingerprint prone
    - Battery Life could have been a bit longer
    - Bluetooth SQ is not exactly the same as wired
    iFi xDSD DAC/AMP Review - The Prodigy

    iFi made a nifty little device, that can do a little of everything, and which doesn't fail in any way to satisfy the needs of the modern audiophile, including the need of a nice-looking device, making xDSD is easy to recommend to anyone looking for a simple-to-use, ergonomic and versatile device that can power almost anything that's portable, and which can sing any way your heart desires.



    iFi xDSD is the new DAC/AMP from iFi, coming to replace and redefine what iFi products are, with a much more stylish design, a much more smaller shape, and promising a sound that will make it worthy of being an iFi product. We'll see what it is capable of, and whether it deserves its place amongst other iFi products.

    iFi Audio is a large audio company from UK, part of the respected AMR Group (Abbingdon Music Research). They are exemplary in every way possible, when it comes to customer satisfaction, finding answers to any issue a customer has, and to being generally very friendly. You can always rely on iFi for warranty, and you can expect the best experience by purchasing from and working with them.

    It should be noted that I have absolutely no affiliation with iFi, I am not receiving any incentive for this review or to sweeten things out. This review is not sponsored nor has been paid for by iFi or anyone else. I'd like to thank iFi for providing the sample for the review. The sample was provided along with iFi's request for an honest and unbiased review. This review reflects my personal experience with iFi xDSD. Every opinion expressed is mine and I stand by it, the purpose of this review is to help those interested in iFi xDSD find their next music companion.

    About me



    First things first, let's get the packaging out of the way:















    iFi's package hasn't changed much since I first reviewed iDSD Black Label, which was years ago now, but still, that one is going strong. Fast forward to today, we're being introduced to a much smaller package, which still keeps the amazing attention to detail, and the large number of extras we're used to seeing from iFi. I am quite happy that iFi is keeping a tradition from including useful extras with their products, and there's hardly anything I can think off that would be further needed, compared to their package formula.

    With xDSD, you get:

    xDSD Unit
    OTG Cable for MicroUSB (basic black one)
    USB Adapters
    Velcro Lock strips that you can glue to xDSD, as well as to your transport for it (No staps stacking!)
    More USB Adapters
    A carrying and protection pouch

    In fact, now that I typed that list, there is something I think I'd want with this package, and that is a Type-C OTG Cable, but happily iFi designs and sells some high-quality ones on their site. Those iFi OTG accessory cables are much better than the original ones, they are harder, they keep memory of the shape you give them, so they stay bended (not pulling on the connectors after you connect them), and they feel quite nice, having just the right length for me.

    For the record, I've been using the Type-C iFi OTG Adapter for xDSD and my smartphone for the past 2 months or so, and I can say with 100% certainty that it causes no damage to the smartphone's jack, even though I often throw them in my pocket, so you can totally get one if you want a better OTG cable, for ergonomics and overall quality. I can't say I noticed any significant sonic difference, but given the affordable nature of an OTG cable, I'd rather use a good one.

    What to look in when purchasing a high-end DAC/AMP (new page)


    Technical Specifications

    USB Input: up to PCM768kHz &amp; DSD512 (24.6/22.6MHz)
    S/PDIF Coaxial and Optical Input: up to 192kHz/24Bit
    Dynamic Range: &gt; 113dB (A)
    Volume Control: -101dB…0dB in 1dB steps
    Output power: &gt; 2.82V/500 mW @ 16 Ohm
    &gt; 3.7V/270mW @ 50 Ohm
    &gt; 3.8V/48 mW @ 300 Ohm
    &gt; 3.8V/24 mW @ 600 Ohm
    Line ot Level: &gt; 2.1V @ 0dBFS (&amp; 0dB Volume)
    THD &amp;N (1V/16R): &lt; 0.005%
    Output Impedance: &lt; 1 Ohm
    Battery: 3.8V/2200mAh
    Dimensions: 95 (l) x67 (w) x19 (h) mm
    Weight: 127g (0.28 Ibs)
    Warranty period: 12 months

    Build Quality/Aesthetics/UI/Firmware

    iFi xDSD is quite different from the typical industrial-looking device iFi created so far, this time their design being a very smooth and liquid one, xDSD feeling like a true high-end tech piece you're carrying with you. People will be pleased seeing you carrying one, and it really looks pretty.




    The finish on it is fairly good, although if you want to avoid scratches, you should take care of it. Like, it is one of those mirror-style finishes, and although it seems fairly resistant to scratches, I wouldn't place it in my pocket right next to my keys.

    This being said, the build quality, is exceptional, this is one tightly packed device that feels like a solid cut of metal, no loose connectors, no loose ends. The glossy, well polished finnish is stunning, but it is prone to fingerprints. The volume wheel is a digitally controlled analogue volume control unit, and this basically means that you don't have to deal with channel imbalance at lower volumes, but you don't get the reduced detail of a digital implementation, the best of both worlds. To explain what this does, basically, the volume acts on a digital control, which then acts on an analogue control unit.

    The volume has a button that lights on a few colors, and that one is a really nice addition to xDSD. Since I now have Chord Mojo in for testing, I have to say both companies were nice to add colors to their products, I like it.

    The buttons on xDSD nice and clicky, nothing loose. In the front, there is a single button, besides the one on the volume wheel. This acts as a cycle between the effects, and a combination of them. Generally, when xDSD starts, it starts with X-Bass turned on, but with 3D turned off. Pressing the button cycles you through the modes, X-Bass Only, 3D only, both active, and both turned off.

    Long pressing the power button will turn on or off the device. Short pressing it, after the unit is already turned on, mutes the sound, and it strats blinking. Good trick to have on hand if you're walking, and you need to stop your music quickly.

    Regardless of how long you press the button, if you first press the Effects Button, while the unit is turned on, then you press the power button, this cycles between the unit being in DAC Mode, where the Headphone Output acts as a line-out, and Headphone Output. If you want to feed an active speaker setup, or a Headphone AMP, you should take into account that using the DAC Mode means that all effects are turned off, as those are integrated in the amplification stage. The nice part about the iFi effects is that those are full analogue effects, so you don't have to deal with low quality digital effects, but you have some fine-class analogue well-implemented effects to work with.

    And as to how well they work, the X-Bass, basically thickens the bass, adds a few dB down low, and a few dB in the whole bass, it is a nice effect for a headphone that needs a little push. It is not a very strong effect, somewhere around 6dB of bass or less are added in practice. The bass doesn't bleed in the midrange, so you can expect a clean, and nice-feeling impact added to your music. The 3D is a little more fiddly, it will work really well with some headphones, but it won't work quite that well with others. This is a slightly more complex approach and it basically enhances certain areas in the upper midrange, treble, and high-treble to get more width in the sound. I find it very useful for headphones where I'd naturally enhance the treble, like Audeze LCD-MX4, but I don't engage it when using Sennheiser IE800.


    At the back of the device, you can find the main USB Input, which is Type-A, which is not that unusual in today's devices, but rather rare outside of audio applications nowadays. There is a microUSB port for charging, as xDSD does not charge from the main USB plug, or at least out-of-the box it doesn't. This means two things, one wonderful, and one slightly inconvenient. The wonderful part is that you can connect xDSD to virtually any smartphone, and it won't drain your smarty like crazy, so you can totally use it without any stress. The inconvenient part is that you need to connect two cables to it if you're using it as a Desktop USB DAC or Desktop DAC/AMP, and you occupy two USB ports, which, if you have a laptop with just few outputs, may mean that you require to consider an external hub.

    Another important feature at the back is the Measure / Listen knob, which basically sets the Interpolation Filter to a measure mode (more natural sound, smoother, better suited for musicality and music), and listen (which basically reproduces perfect measurements, but sounds a bit too textured, has a tad too much detail in the midrange, which may be fatiguing). Nowadays I find myself using "Listen" more regardless of the headphones xDSD is connected to.

    The software tends to be glitch-free, and I haven't ran into a single software glitch a single time, though I do consider that having the single LED power indicator at the back, just below the microUSB charging connector makes it hard to notice, and I ran out of power once or twice because of it.

    I found it a major improvement on xDSD, compared to iDSD BL Micro, that the rubber legs are already set in place.


    The unit gets warm in usage, but it never struck me as hot, and if it is cold outside, it doesn't even get warm, if you're pocketing it while walking.

    Now, compared to most other iFi products, this is probably where they made the most major improvement, xDSD is truly pocketable! In fact, it is so pocketable, that I never even brought my DAP / Stack bag with me to Bucharest, and I left it at my home, last time I visited that place. Of course, now it's Winter in Romania, and quite cold, so it fits easily into jacket pockets, but still, I love how little it adds to the size of my smartphone.

    Connected to a PC, it simply works, the iFi USB drivers are pure love, simple and reliable, it works plug and play every time, and it kept working through all Windows Updates.

    I found a minor inconvenience in the fact that you need to activate the USB BT by pressing the effects button after it has already been paired. Not a major thing, but it made the pairing process a bit more complicated than it needed to be. The sound out of BT is quite different from the sound straight from a USB Input, and not in a necessarily positive way. There are headphones that sound better with BT connection, like AIWA ARC-1, but here, xDSD sounds better, considerably better, using its USB input rather than Bluetooth.

    On the right side, there is no delay in using it as a USB DAC, to watch movies and other content, and there is no delay when using it as a USB DAC from PC.

    All in all, iFi xDSD is built like a champ, stands well to usage, and has all the bells and whistles you could wish for in a device at this price, but I'd consider using the wired more whenever possible.

    Sound Quality

    The signature of iFi xDSD is quite the one, rather neutral, clean, clear, well separated, and with a great amount of detail. If we're talking about devices in this price range, it needs to find with other 400 USD devices, so even the bigger iDSD Black Label Micro is among its enemies, as well as DAPs in this price range, like Cayin N5ii, and Opus #1s.


    This being said, the bass of xDSD is natural in speed, working well with all types of music and all kinds of headphones. When engaging the X-Bass setting, you get a larger bass, with a better impact and overall presence, much more pleasing with headphones that don't have enough bass. It actually has a really positive impact on IEMs like Sennheiser IE800, which may be a tad bright and too thin at times, giving them just a bit more thickness to balance out their really sparkly top end. I can hear a lot of deep hits with xDSD, when connecting it to LCD-MX4, and engaging this X-Bass, and the overall bass of the device is solid enough to make a name for it.

    The midrange is fairly neutral, without a strong coloration either way. If there is something, there is a fine tilting towards a very slight warm tonality, but this may be given also by the "Listen" setting I used predominantly when testing it. The overall revealing ability is fairly good, especially for this price range, and it is always fun to hear something more organic, as this is a good word to describe xDSD. It is a touch less organic and less smooth than its bigger brother, iDSD Micro BL, but this may be for the better, as it gives xDSD better versatility with metal and more aggressive music. Voices are natural, and ever so slightly forward, pointing to an ever-so-slightly intimate soundstage.

    The treble is sparkle and extends very well, but doesn't lean towards being too smooth, nor towards being too grainy. It is just as textured as it should be, as present as it should be, really neutral, and well expressed. The good overall treble actually balances out the slightly forward soundstage to give xDSD a nicely-large soundstage, with air and space between instruments being good enough to mentally place things in the musical scene.


    The soundstage of xDSD is actually not the widest out there, being on the verge of what I'd call slightly intimate, but then there's the good part with having the 3D effects employed by iFi. While they may not sound their best with absolutely every singe IEM and Headphone out there, those effects worked just fine with about 80% of the headphones I tried them with, bringing good results with Audeze LCD-MX4, Ultrasone Signature DXP, and FLC8N. On the other hand, the enhancement was a tad much with Sennheiser IE800 and HIFIMAN RE800Silver. In its natural shape, the soundstage is a bit wider than it is deep, presenting a few layers of music between the listener and the source, with the right earphones. The stereo separation is incredibly good though, and there's very little to no crosstalk, and the instrument separation, is excellent, as well, leading to a fun and enjoyable final presentation.


    The ADSR / PRaT area is now renamed to Textures, as I always made the connection between the impulse response of a headphone with how the texture is rendered, since I composed music using synths before, and this made sense, but I realised that it may be more straight-forward to name this area Textures. With the filter engaged to "Listen", you get an organic and natural overall presentation with a natural to slightly slow response of the bass, a natural response of the midrange, and a natural response of the treble, textures are fairly natural all-around. Engaging the 3D soundstage doesn't change this, but engaging the X-Bass slows down the bass a little, resulting in a slower overall bass.

    With the Filter engaged to "Measure", xDSD plays a quicker overall texture in the midrange, and quite considerably so, along with a slightly quicker texture in the bass and the treble. Again, engaging X-Bass will slow the bass a bit, but now by a large margin. This one setting will be awesome for those who are really into hearing more detail, and who want to give their IEMs and Headphones a bit of an "Etymotic" flavour, without getting a pair of ER4XR themselves.

    Potable Usage

    xDSD is a portable, and a desktop unit at the same time. It is mainly made to be portable, by having a small body design, being lightweight, and being easy to stack, but it can also play the role of a veritable DAC in a complex audio system, for those who want to have one device to take with them when traveling around.


    As a portable device, it is light enough to make a good stack, and with the proper iFi USB OTG cables, it actually makes a neat and tidy setup. There are no downsides to using it in this mode, it has good controls, well-placed buttons and controls, the volume wheel is easy to access while in a pocket, and you can mute it easily while walking, so you don't have to worry about that, you don't set the Measure / Listen filter often, so that button is in the back, and the setting button in the front is actually welcome and well-placed, easy to access.

    The battery life is good enough, but I'd prefer for future devices to be a bit thicker, but feature a slightly longer battery life, as with xDSD, it lasts about 8 hours when playing music almost at max volume, for the entire time. This is not bad by any means, it just happens that I sometimes take longer trips and realise that I need a backup or a charger of some sort.

    It is good for hiking and exploring, if you're around your town though.


    Bluetooth, while not sounding as good as wired with xDSD, has excellent performance, and you can throw it in a bad, and enjoy your music from your smartphone, but this usage makes less sense, since you'd have to adjust the volume using xDSD's wheel anyways, as that has a well-implemented volume control, while adjusting it from your smartphone will degrade sonic quality.

    As a desktop unit, it looks nice, it looks fun, and sits well on a desk, its DAC is potent enough to make up for a great overall experience. Here, the only two complaints one can have, are the cable in the back, the blue one, for the USB DAC function being rather thick and more complicated to hide, if you want a really neat and tidy desk, and the charging cable, which adds to the cables you need to manage for using it (also the cables you need to connect / disconnect when using it).

    All considered, xDSD has great portability, much better than the original iDSD Micro BL had, and it is worthy to be named a nice portable DAC/AMP. In fact, when compared to something like DH1000 from HIDIZS, which I liked quite a bit, it is more portable, because DH1000 has no rubber feet, and it kinda rubs together with the smartphone or DAP, while xDSD stays well separated from it.


    There are lots of products that should be compared to xDSD in terms of ability, but for today, iDSD Black Label Micro (500 USD), Opus #1s (400 USD), and FiiO Q5 (350 USD) will be today's enemies for iFi xDSD


    iFi xDSD vs FiiO Q5 (AM03A) - Of course, we should start with the more dangerous enemy. iDSD BL is just the bigger version, and #1s is a DAP, so the one devices that places xDSD in most danger is iFi's key card, Q5. The package they come with is all-inclusive for both, both have a good amount of accessories, both are well packaged, and both are nicely presented. The build quality is full metal for both, both are solid devices, and both have well-placed buttons for one handed control, being easily stackable. The one thing you start to notice as a difference is the fact that Q5 has a removable AMP bottom, which makes for a neat difference, when you consider that for 100USD you can upgrade Q5 to an entirely better sound (with AMP5). xDSD gains some points in terms of aesthetics, with its glass finish, but loses some when it comes to the Bluetooth abilities, as it has its sound changed quite a bit in BT mode, while Q5 sounds more similar between its bluetooth and wired mode. The battery life is similar, too similar to make up for a real difference, and the usage is flawless for both, when it comes to their software, neither has any bugs to talk about. The sound, though, is quite different. The first difference that comes in sight, is FiiO's versatility, with a modular design, you're not locked to AM03A, which is a very wide-sounding AMP, wider than xDSD in its default configuration, though xDSD is a bit deeper in its scene presentation. The detail levels are similar, with xDSD being more organic in the way it presents each musical note, and with Q5 with AM03A being more revealing, more precise. Here's a matter of musicality vs technical ability, and each does their job quite well. The signature is neutral for both, and both are good at driving full-sized headphones, but while xDSD is better than Q5 with its AM03A, if you add AM05 to Q5, it has better driving abilities, with better control, and more power in actual usage. Of course, then Q5 becomes 50$ more expensive than xDSD. Now, if you're wondering which you should get, the first question you have to ask, is whether you want a one-piece device, like xDSD, or a modular device, like Q5. Then, if you feel you'll upgrade Q5, or just want the modularity to be there, because if you're not taking advantage of adding AM05 to Q5, then xDSD makes a better overall deal. If you want to take the time to upgrade Q5, tweak it, and if you want to take advantage of its Bluetooth, then it may make a better overall device for you, but keep in mind the design and ergonomics of each when making your choice, as, as much as we want to deny it, we all like one better than the other aesthetically.

    iFi xDSD vs Opus #1s - You may wonder who would ever place a DAC/AMP against a DAP, but you also have to wonder, if you have exactly 400USD, and you want to make a solution for music listening, wouldn't you consider both options? The truth is that most people don't always consider all the options they have, but sometimes, something that wasn't initially evident may actually have been a better overall ending. With Opus #1s, the build quality and package are not very relevant. What is relevant though, is the fact that Opus #1s has two microSD slots, and almost no DAP inexpensive enough, and absolutely no smartphone has two microSD slots, so here, if you have a huge music library, you'll probably want to go with #1s. Then, the ergonomics, are better for #1s compared to xDSD, because, as much as we'd want to deny, #1s is a single device, while xDSD will always be part of a stack, and that means a longer device, with cables hanging out, and all. Here's where the winning points for #1s end though, because xDSD has much better Bluetooth abilities, as it can connect to a wider array of devices. This being said, xDSD is more of a BT received, while #1s is more of a BT sender. The sound, though, is generally in favor of xDSD, and this explains why you may want to invest more in a DAP that has similar sonic abilities. xDSD has better driving power, and better overall control, better detail, and a more organic sound. #1 makes up for those a little, by having a slightly wider soundstage, but then xDSD wins in terms of dynamics as well. This being said, if you're looking for a DAP at this price, and if you have a huge collection, #1s makes a lot of sense, while if you're looking for a DAC/AMP, and if you like Streaming music (you can do that with a smartphone you'd use xDSD with), and if you value sonic performance above all, xDSD provides a better sound for virtually the same price, making the better choice, provided you already have a source (which reminds me that #1s makes an awesome source, and you could pair them together, if you already have one of them).

    iFi xDSD vs iDSD BL Micro - The big boy enemy of xDSD was lefty at towards the ending of the comparisons area, mostly because it doesn't make much of a comparison, in terms of who'd use both. In short, BL Micro is a much much larger device, 5-6 times larger in volume when compared to xDSD. It is just as well put together, but it is much larger, with a much more industrial look to it. iDSD Micro has no Bluetooth, but it does have the X-Bass and the 3D sound effects built-in, which means you can still take advantage of iFi's excellent enhancement implementation (This is not a DSP, Digital Signal Processing, as xDSD has fully analogue circuits doing all the work for your ears). One big difference in desktop usage, is that iDSD BL Micro has a dedicated Line Out Output on the back, which xDSD does not. iDSD BL Micro also requires just one cable for both data and power, while xDSD requires two, making iDSD more suited for desktop usage, if you want a clean desk. Now the sound, is much much better on iDSD BL Micro. It has much better detail, a much better driving power, a lot more detail, an insanely larger soundstage, with a deeper presentation, with more layering and a better instrument separation. This being said, it is more laid-back, and more smooth, while xDSD is more energetic and has a more uplifting overall presentation. Now, if you might be wondering why would you go for xDSD while the same company makes a much better sounding product, the answer is that iDSD BL Micro is not really portable.


    It is transportable at most. This being said, xDSD is fully portable, easily stack-able, and you can always enjoy your favorite metal piece in the bus, without having people staring at you both because you're a meatlhead and because you have a weird device, now their only reason to stare being the questionable music they can hear, because you are listening to aggressive metal at high volumes... Wait, no, this is usually me doing this. At any rate, if you're looking for a neat desktop device, you should totally consider iDSD BL, but be noted, that it isn't what I'd consider taking with me when meeting the parents-in-law and trying to make a good impression, while xDSD is something you can even take with you at a starbucks and enjoy a coffee, without raising any eyebrows. Also, of the two, xDSD is the only which has Bluetooth abilities.


    Now, xDSD pairs really well. So well, that I think it is universal. It would be possible to list my entire collection of headphones here, and it would still make great pairings, but I'll pick a few favorites that really pair well with xDSD, and which make a neat setup for both taking a fun walk through a busy city, traveling, or just discovering joy while at home.


    iFi xDSD + Ultrasone Signature DXP - This is one pairing I've used quite a lot, not only because it sounds good, but also because it is portable, and looks stylish. The glass on the cups of Signature DXP pairs really well with the glossy surface of iFi xDSD. Now, the sound, is actually helped by those little features of xDSD, the 3D and the X-Bass, as, although Signature DXP does not require any of those to sound enjoyable, they give it a bit more sparkle, a bit more impact, making the whole headphone sound more dynamic, more explosive, more V-shaped, more vivid, more impressive. The textures with xDSD are rendered really nice and organic, and while some older Ultrasone Headphones were a tad too sparkly in the top end, with xDSD's organic nature, and with Ultrasone's new technology, you can always expect a natural experience with this pairing. This pairing is versatility at its finest, being a pairing that can play both your Led Zeppelin, Jill Tracy and even Rob Zombie without batting an eye. Furthermore, there wasn't a single music style that sounded bad on them, and I could open heartedly recommend the pairing regardless

    iFi xDSD + FLC8N - While the review for FLC8N just went live, and I had a lot of fun writing about them and listening to them, pairing them with xDSD is something I haven't talked about in their review. Now, FLC8N is one of those IEMs that really doesn't require the X-Bass, nor the 3D effects of xDSD, both of those being potentially detrimental to the overall sound of FLC8N, giving them maybe a bit too much sparkle and maybe a bit too much bass. Even so, in its default configuration, xDSD is able to show excellent control and detail with FLC8N, and the soundstage is quite huge, which you can expect from FLC8N paired with most sources, while the midrange is rather organic and natural. The other big surprise with FLC8N is the treble, which is very sparkly, and very clear, but it is never too bright or grainy, making up for a really fun trip with both electronic, and metal music. Jazz and pop also sounds quite intriguing and blissful. The one type of music this pairing isn't really made for is vocal and voice-centric music, as FLC8N has a recessed midrange, and regardless of the fact that xDSD has a slightly forward midrange, there are other options for those who want the midrange to be the most forward element in their music.

    iFi xDSD + iBasso IT04 - This is another pairing I am really a fan of, not only because the organic midrange of xDSD pairs really well with IT04's smoother character, but also because IT04 is one of the more neutral IEMs, and it really sounds better when you engage the X-Bass feature on xDSD, resulting in a much more fun and pleasant overall sound. Of course, there are lots of people who prefer the quick and tight experience of IT04 as it is, and don't feel the need to enhance it in any way, but if you ever wanted to make things a little balanced, one of the most naturally sounding solutions is at your fingertips, which is part of why xDSD is so convenient, because it can improve the sound without you having to know how to EQ something out, and without all the hassle of having to switch between EQ profiles between headphones. Makes a big difference for those who just want a simple device that works.

    Value and Conclusion

    We had a long nice talk about xDSD from iFi, and it is time to reach a conclusion. Let's begin by admitting that we've been talking about a 400 USD device, which is not cheap by any means, and this is quite up in the midrange for DAC/AMP devices, being quite close to what a full-blown desktop Tube Amplifier like Felix Echo costs. This being said, iFi xDSD makes itself remarked in a few ways that will surely allow it to survive in the market, even in this crazy-quickly changing world.


    First off, the build quality is excellent, and FiiO thought about everything when they designed the package, so you don't have to worry about your favorite accessory missing. You can even add some of the best OTG cables for a little price, by also ordering one of iFi's own OTG cables when getting an xDSD.

    The build quality is really solid, as it is quite literally make mostly from metal, with a glossy, high-end look, and with an accessible front dial for adjusting volume / muting the unit, with an effects button right next to that, and with the audio jack on the same side. The back further allows for more sonic customization, with a Listen / Measure Filter, which will change the way textures are reproduced.

    The effects are implemented well, and they sound very good, not coloring the sound in a negative way, and I found myself using them more often than not. There's even a Bluetooth connection, which has some further effects sprinkled into it, but the unit will still sound a bit better when using it via a cable than when using it by BT.

    The overall device operation is very easy, and intuitive, and it is hassle-free, like is the DAC operation, as its software has been written really well.

    The sound performance is quite good, if you like a slightly intimate sound, with a natural and organic overall presentation, a fairly good depth, and a good resolution for the price. You get all the extension you can want both ways, and xDSD is easy to pair with virtually anything, plus you get the advantage of having the X-Bass and 3D effects at your fingertips, making xDSD quite a good overall options regardless of whether you have a bright headphone, and you'd like it to be a bit darker, or if you're having a dark headphone, and want to give it a little more sparkle.


    In the end, iFi made a nifty little device, that can do a little of everything, and which doesn't fail in any way to satisfy the needs of the modern audiophile, including the need of a nice-looking device, making xDSD is easy to recommend to anyone looking for a simple-to-use, ergonomic and versatile device that can power almost anything that's portable, and which can sing any way your heart desires.

    Audiophile-Heaven Link: https://www.audiophile-heaven.com/2018/12/ifi-xdsd-dac-amp-review-prodigy.html

    Playlist used for this review

    While we listened to considerably more songs than those named in this playlist, those are excellent for identifying certain aspects of the sound, like PRaT, Texturization, Detail, Resolution, Dynamics, Impact, and overall tonality. We recommend trying most of the songs from this playlist, especially if you're searching for new most, most of them being rather catchy.

    Bats - Gamma Ray Burst: Second Date
    Eskimo Callboy - Frances
    Incubus - Summer Romance
    Electric Six - Dager! High Voltage
    Kishida Cult - High School Of The Dead
    Dimmu Borgir - Dimmu Borgir

    Breking Benjamin - I Will Not Bow
    Thousand Foot Krutch - The Flame In All Of Us

    Gorillaz - Feel Good Inc.
    Infected Mushroom - Song Pong
    Attack Attack - Kissed A Girl
    Doctor P - Bulletproof
    Maximum The Hormone - Rock n Roll Chainsaw
    Rob Zombie - Werewolf, Baby!
    Escape The Fate - Gorgeous Nightmare
    SOAD - Chop Suey
    Ken Ashcorp - Absolute Territory
    Machinae Supremacy - Need For Steve
    Ozzy Osbourne - I Don't Wanna Stop
    Crow'sclaw - Loudness War
    Eminem - Rap God
    Stromae - Humain À L'eau
    Sonata Arctica - My Selene
    Justin Timberlake - Sexy Back
    Metallica - Fuel
    Veil Of Maya - Unbreakable
    Masa Works - Golden Japang
    REOL - Luvoratorrrrry

    Korn - Word Up!
    Papa Roach - ... To be Loved
    Fever The Ghost - Source
    Fall Out Boy - Immortals
    Green Day - Know The Enemy
    Mindless Self Indulgence - London Bridge
    A staic Lullaby - Toxic
    Royal Republic - Addictive
    Astronautalis - The River, The Woods
    We Came As Romans - My Love
    Skillet - What I Believe
    Man With A Mission - Smells Like Teen Spirit
    Yasuda Rei - Mirror
    Mojo Juju - Must Be Desire
    Falling Up - Falling In Love
    Manafest - Retro Love
    Rodrigo Y Grabriela - Paris
    Zomboy - Lights Out
    Muse - Resistance
    T.A.T.U &amp; Rammstein - Mosaku
    Grey Daze - Anything, Anything
    Katy Perry - Who Am I Living For
    Maroon 5 - Lucky Strike
    Machinae Supremacy - Killer Instinct


    I hope my review is helpful to you!


    Contact me!





      audiomonkey777 and davidmolliere like this.
    1. audiomonkey777
      Good thorough review - thanks. Great playlist and beautiful photos. I currently have the nano BL and thinking about an xDSD.
      audiomonkey777, Sep 13, 2019
      Dobrescu George likes this.
    2. Dobrescu George
      Dobrescu George, Sep 18, 2019
  4. Army-Firedawg
    The next logical step for the iDSD successor.
    Written by Army-Firedawg
    Published Aug 28, 2018
    Pros - Incredible sound quality, strong build, very lightweight and slender, battery life, impressive feature *offerings*, good power. Intangible difference in sound quality from wireless or wired modes.
    Cons - Price is a hard sell over the Micro iDSD BL. Instruction manual. Not a very noticeable difference having the main selling features on/off (3D+/XBass).
    This review has been edited to correct my mistake I made in about the Features section of the combi. I was able to try the unit out again for a few days and correctly utilized the wireless mode I had such an issue with originally. The rest of the review was correct.

    During my few years I’ve been reviewing audio products, there’s been a few brands that I’ve had the honor of coming to both learn about and listen to several of their products and consistently be impressed with. One of those such brands is iFi. It seems that every product that I’ve the honor of being able to listen to and/or review I’m always impressed with. Now enter another of their offerings into the mobile market, the xDSD. Coming in at twice the price of its iDSD BL older sibling that I really came to love, I’m quite interested to see what it brings to the table.

    A little about me

    I would like to say that first and foremost I am NOT an “audiophile” but rather an audio enthusiast. I listen to music to enjoy it. Do I prefer a lossless source? Yes, of course. But I can still be very happy streaming from Pandora or even my YouTube “My Mix” playlist. I also prefer equipment that sounds the best to me personally regardless of what frequency response it has or rather or not it's “sonically accurate” and I always have and shall continue to encourage others to do the same.

    I'm a firefighter for both the civilian and military sector and the cliché of wanting to do this since I was born couldn't be more present with me. I've worked hard over the last several years to earn this position and now it's time for me to work even harder to keep it.

    My interests/hobbies are powerlifting, fishing and relaxing to audio products and reviewing them to help other decide on what products would work for them. Few things make me as an audio enthusiast/review feel more accomplished than when someone tells me that I helped them find the type of sound they've always been looking for.

    Now, the sound signature I personally favor is a relaxing, warm and sensual sound that just drifts me away in the emotional experience of the music being performed. Yes, accuracy is still important but I will happily sacrifice some of that if I'm presented with a clean, warm sound that can wisp me away into an experience that makes me yearn for more.

    My ideal signature are that of respectably forward mids and upper bass range with the bass being controlled but with some slight decay. I like my treble to have nice extension and detail reveal with a smooth roll off up top as to not become harsh in the least. Examples of products that have given me chills and keep giving me the yearning for more feels are the (in no particular order) Bowers & Wilkins P7, Oppo PM-1/2, Empire Ears Hermes VI & Zeus XIV, Audeze LCD-XC, Meze Headphones 99 Classics.

    Equipment used at least some point during the review


    -Empire Ears Hermes VI

    -Meze 99 Classic

    -Oppo PM-1

    -Sennheiser HD650


    -LG V20/HP Pavilion

    -Playing Pandora, YouTube, and various format personal music


    I am by no means sponsored by this company or any of its affiliates. They were kind enough to send me a product for an arranged amount of time in exchange for my honest opinion. I am making no monetary compensation for this review.

    The following is my take on the product being reviewed. It is to be taken “with a grain of salt” per say and as I always tell people, it is YOUR opinion that matters. So regardless of my take or view on said product, I highly recommend you listen to it yourself and gauge your own opinion.

    The Opening Experience

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    Why I feel so strongly about the initial unboxing experience

    Please allow me to explain why I feel so strongly about the initial unboxing experience with a product. Maybe it’s due to my southern roots in the hills of eastern Kentucky, but I’ve always been raised under the pretense of when you introduce yourself to someone for the first time you present yourself with confidence, class, character, pride, and competence. You greet the other person with a true warm smile, eye contact and a firm handshake. Anything less or short implies to other person that you either don’t care about them, are too full of yourself, too busy to be bothered by the likes of them, or worse, just generally disrespectful.

    As a consumer, I take this same belief to when I open a new product. Why? Because think about it this way. How else can a company introduce themselves to their customers? How do they present their products? Are they packaged with pride and presented in such a way that makes the listener eager to listen to them? Or maybe they’re just wrapped up and placed in an available space. How about the box itself? Is it bogged down with jargon that says look at this, look what I can do. I’m better than anything on the market and here’s why read this and check out that. Or, is the package clean, simplistic and classy? As if saying to the customer ‘Good day, pleasure to meet your acquaintance. Please give me a listen and allow me to show you what I can do and allow my actions to speak louder than my words.’

    This is why I feel so strongly about the initial presentation of a product, and I feel it’s truly a shame more people don’t. But with all that aside, let’s discuss how this products introduced itself shall we?

    As with about all of iFi products the xDSD is delivered very professionally albeit in my opinion a bit cluttered. The outer packaging is iFi’s standard white box with the product pictured on the front and a bit of features the product has. The sides and back continue this with the back being in much greater degree with input/output power etc… listed. Though I can understand the specs being printed on the packaging somewhat I still personally believe the vast majority of it can be placed inside a pamphlet on the inside of the box.

    As you open the exterior cover and the inner box, which is a solid white box with only the iFi logo printed on the top (which is what I like seeing), you’re greeted with the owners manual and startup guide, a cloth pouch that holds the xDSD inside, and a square box that holds A LOT of cables and adaptors and the like.

    I feel like I’ve received a consistent handshake from iFi as I have with all the previous unboxings I’ve done from them. I was delivered a very nice product with the level of care and conscious thought that I personally appreciate seeing company’s take the time to put together, and I at least appreciate it.


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    The construction of the xDSD is, as I’ve come to expect from iFi, very well made. The vast majority of the frame is of an aluminum like material with minimal plastic, that at least I could see. The front of the xDSD consists of a 3.5mm balanced OR unbalanced output port, the input source and sample rate lights, the volume knob/power button/mode switch (as I’ll discuss later), 3D+ and XBass+ identifier light and the settings/bluetooth button. The bottom has 4 rubber feet to keep it from scratching both itself as well as the product it’s paired with. Finally, the back has a 3.5mm line out port (yup, it can also be used in line out mode bypassing the amp completely), usb jack, listen/measure filter switch and lastly a micro USB charging port (which I wish would’ve been a type C but oh well).

    I believe iFi did a great job in the build quality of their xDSD. It’s very lightweight yet feels structurally sound in my hands. It’s slim and only minimally adds to the size of my phone that I’ve tethered the xDSD to, so my pocket isn’t maxed out. So well done.

    Specs (copied straight from the iFi website)

    USB Input:

    up to PCM768kHz & DSD512 (24.6/22.6MHz)

    S/PDIF Coaxial and Optical Input:

    up to 192kHz/24Bit

    Dynamic Range:

    > 113dB (A)

    Volume Control:

    -101dB…0dB in 1dB steps

    Output power:

    > 2.82V/500 mW @ 16 Ohm

    > 3.7V/270mW @ 50 Ohm

    > 3.8V/48 mW @ 300 Ohm

    > 3.8V/24 mW @ 600 Ohm

    Line out Level:

    > 2.1V @ 0dBFS (& 0dB Volume)

    THD &N (1V/16R):

    < 0.005%

    Output Impedance:

    < 1 Ohm




    95 (l) x66.5 (w) x19 (h) mm


    127g (0.28 Ibs)

    Warranty period:

    12 months

    Instruction manual (tells what the indicator lights etc… show)

    Features *CORRECTED*

    Like most iFi products, it’s not simply an insert here product. The xDSD is not only a portable amp and dac (or combi as I call them) but it also has a few, pretty darned neat, settings that I believe set it apart from others in the combi offering.

    The first feature(s), that I noticed at least, is that the xDSD has 2 available modes that you can take advantage of, them being 3D+ and XBass+. Now, as unfortunate as it is, I personally could not hear any tangible difference in sound when switching between the modes. The XBass+ I completely heard nothing different and the 3D+ I kinda sorta heard a little bit different sound. This was really disappointing because I have SO much praise for it when I heard it on the iCAN Pro (granted it’s MUCH bigger and MUCH more expensive). Something I think would have made it better though is the ability to turn on/off each mode individually vs having to cycle through them like you currently do. I still don’t believe I would hear much but having the ability to turn it off and immediately back on would have really helped test if there’s a difference or not.

    The next thing I noticed is that it’s Bluetooth capable. Admittedly, I only used the Bluetooth setting to test it for my review for I personally can foresee very few instances where I’ll not have my phone on me but will a pair of headphones and the xDSD. But during the time I was using the xDSD in wireless mode I will say, it’s, at least from my memory, the cleanest sounding bluetooth that I’ve ever heard. I went from wireless mode to wired mode and, at least personally, couldn’t tell any difference in sound quality. I can already hear the mobs lighting their torches at that sentence but I really couldn’t. Now, while it was in wireless mode I was able to hear a SLIGHTLY more noticeable difference between having the 3D+ and XBass features on or off, so that did give it some added feature but I must stress, to my ears, the difference was very slight.
    To switch between wired and wireless mode is quite simple (though it's not listen under the wireless mode in the instruction manual [it's under the power section]), while the unit is off, hold the power button down until the light changes from green/blue to the other color and then once it changes, simply release the button. The xDSD should also automatically go into pairing mode at this point as well. However, if it doesn't all you need to do is, while it's on and in wireless mode, hold down the settings button for about 3 seconds and it will force pair to your device.

    So overall I think that iFi did a really good job with making a well made wireless combi unit with some cool features. Though I personally didn't hear too much of a difference with the 3D+ and XBass, that's not to say others will not. They did do an amazing job with the no loss of sound quality (which I'll of course touch on next) when going from wireless to wired mode. My only real complain is that I wish the instructions would be organised a bit better.



    Like most iFi products, it’s not simply an insert here product. The xDSD is not only a portable amp and dac (or combi as I call them) but it also has a few, pretty darned neat, settings that I believe set it apart from others in the combi offering.

    The first feature(s), that I noticed at least, is that the xDSD has 2 available modes that you can take advantage of, them being 3D+ and XBass+. Now, as unfortunate as it is, I personally could not hear any tangible difference in sound when switching between the modes. The XBass+ I completely heard nothing different and the 3D+ I kinda sorta heard a little bit different sound. This was really disappointing because I have SO much praise for it when I heard it on the iCAN Pro (granted it’s MUCH bigger and MUCH more expensive). Something I think would have made it better though is the ability to turn on/off each mode individually vs having to cycle through them like you currently do. I still don’t believe I would hear much but having the ability to turn it off and immediately back on would have really helped test if there’s a difference or not.

    The next thing I noticed is that it’s Bluetooth capable. Admittedly, I only used the Bluetooth setting to test it for my review for I personally can foresee very few instances where I’ll not have my phone on me but will a pair of headphones and the xDSD. But during the time I was using the xDSD in wireless mode I will say, it’s, at least from my memory, the cleanest sounding bluetooth that I’ve ever heard. I went from wireless mode to wired mode and, at least personally, couldn’t tell any difference in sound quality. I can already hear the mobs lighting their torches at that sentence but I really couldn’t.

    There are a few drawback with the wireless mode though, 1 major (that actually branches off into a few of them), 1 minute and 1 that makes no sense to me. The one that makes no sense to me is that when in Bluetooth mode, you can no longer control the volume from the xDSD, it’s all from the Bluetooth connected device. Now, why this makes no sense to me is, why would I need to have my phone on my persons? If I’m going to have it on me I might as well just hard wire the thing, this leads me into the minute thing, which is that when in wireless mode, you no longer have access to the 3D and XBass + modes. This, to me, isn’t really a big deal because, as I said above, I personally couldn’t hear much of a difference that they made.

    Now, onto the major issue I have with the Bluetooth. It’s absolutely infuriating. From my time with it, it took me way too long to figure out how to get it into pairing mode. The instructions say from power on, you can force it into pairing mode by holding down the settings button for three seconds. This is not entirely correct. Yes, you have to hold the settings down for 3 seconds, but it needs to be in power OFF AND you need to hold down the power button AND settings button at the same time. I figured this out by trying it on a whim, so if the instructions for pairing would be a bit more clear, that would be fantastic. To continue, when getting it out of wireless mode, you must turn the xDSD completely off and hold the power and settings button together until it comes on and the blue light turns green. This would be fantastic if it would do that first try. I had to do this 6 times before it would go back to its “normal” wired mode. The other 5 it would be like it was in wireless mode, i.e. the volume and 3D and XBass would not work, everything had to be controlled from the phone. During this time I had my phones Bluetooth off completely and I also went back and forth with having it plugged in via usb to see if that would help, it did not. Granted, I do see this being fixed in a, hopefully very soon, software update so later viewers of this review will likely not have any issues, but at the moment, the xDSD wireless mode was absolutely and ridiculously annoying.

    So my final thoughts on the features of the xDSD is that, it’s cool that they offered some unique features, but, at least from my experience with the unit, there needs to be a lot of follow up with it because in its current form, I see the xDSD as being nothing more than a run of the mill combi and in fact, I liked the sound of the Nano iDSD Black Label much better.



    As with all iFi products I’ve had the pleasure of experiencing, this is one aspect that they consistently impress me with, and the xDSD is of no exception. Before I go into this section, I judged the sound off of NOT having the 3D+ OR the XBass+ setting turned on. Though, as said above, I personally heard no discernable difference with it turned on, I wanted to ensure I’m hearing the xDSD for its performance and not a setting that may swade the opinion one way or another. Also, I had it connected to my phone via USB. As I also said earlier, I personally didn’t hear any difference between the wired and wireless modes, my same reasoning applies (I also didn’t want to mess with the wireless mode and get frustrated again).

    For the most part I find the xDSD to present its sourced music very accurately. The level of detail that this little device can push forth is quite impressive to say the least. A song I’m listening to as I’m writing this section is such a nice piece in general but it’s certainly catering to my current love for the Violin. But “Introduction and Rondo Capriccioso” by Saint-Seans from the Your Lie In April anime is played amazingly clean from the xDSD. Yes, all I have to work with is the YouTube video (CD hasn’t came in yet) but just from that low quality playthrough it’s no amazingly impactful and the xDSD, in my complete surprise, didn’t miss a beat on the impact of the piano or violins duet. Now, I will say that I do believe the treble is very slightly toned back a little bit. There’s a few notes that, when played on my desktop setup, just come alive but the xDSD, though keeps a close level of detail, it doesn’t bring that realism to the degree my desktop rig does, as I wouldn’t expect it to, but the slight treble reduction I did notice.

    One thing I would like to cover is the ability for the xDSD to drive a pretty impressive array of headphones. From the oh so infamous HD650 to my hypersensitive Hermes VI, the xDSD was able to play them without a skip. Now, the Hermes VI did still sadly have the hiss that a vast majority of products just can’t quite play a black enough background to get rid of but it was very subtle. So as long as you’re not wanting to power an absurdly hungry headphone, you’ll very likely be more than happy with the xDSD’s ability to power your product.



    My final thoughts on the iFi xDSD is that, for the most part, they’ve done a wonderful job, price no object. The build quality is to what I’ve come to expect from iFi as well as its liquid smooth sound. Though the instruction manual got the better of me, the functionality is quite solid and easy to use (for most :p). For those who, like me, will rarely use a wireless combi, it's a hard sell over their fantastic Micro iDSD BL.

    Also, make sure to check out my unboxing and review videos. They’re pretty awesome AND you getta put a face to the Army-Firedawg name. If this review helped you out at all please hit that thumbs up button for it really helps me out a lot. Till next time my friends, stay safe.
      damart81, B9Scrambler and volly like this.
    1. damart81
      Thanks for this review!
      damart81, Oct 4, 2018
      Army-Firedawg likes this.
    2. Army-Firedawg
      Glad it could be of help to you.
      Army-Firedawg, Oct 15, 2018
    3. audiomonkey777
      Interesting that you say you hear no difference between the wired and the wireless modes? I'd be interested in using the BT ALOT. Currently got their nano BL but feeling the need for Bluetooth and a step up.
      audiomonkey777, Sep 13, 2019
  5. gto88
    All around portable Dac/Amp
    Written by gto88
    Published Aug 28, 2018
    Pros - Ultimate DAC : PCM768KHz/DSD512/MQA, bluetooth, driving power
    Cons - cable can be better
    Headphone - Sony Z1R
    Comparison Gears:
    FiiO Q5 (dual AK4490EN)
    Pro-ject Pre Box S2 Digital (dual ESS9038Q2M)
    iFi xDSD (Burr Brown chip)

    Before I received this tour unit, iFi xDSD has received award from
    EISA (the European Sound and Imaging Association)
    as the Best Portable DAC/Headphone Amplifier for 2018-2019.

    There are many reviews have been posted out, so I am not going through
    all introductions of the products, but jump to my own experiences and
    usage comments.

    I own iFi iDSD nano, and had reviewed iFi Miacro iDSD BL before,
    so the latest driver is already in my computer, I plug it to my laptop USB port
    and the device shows in my PC and in Foobar2000 output list.
    iFi has unified its driver for many products, which is an excellent consideration
    on product support, which also has simplified life for users who own many iFi products.

    first impression
    when I have it in my hand.
    It is small, surely more portable than iDSD nano that I own which I have never
    thought to use it as portable but put it in my office as desk Dac/Amp.
    The shell of xDSD is supposed to be shining but soon got finger print marks
    on the body once you hanlde it in your hand starts to play with it.
    Other than that, the build is rugged, size is easy to handle.
    However, its small and shining body slip off my hand when I picked it up from desk.
    One needs to be careful when handle it on the go, you don't want it to slip off
    on ground.

    cables can be better, most product in the market tend to come with
    cables that look cheap, and they still are with xDSD.
    Since iFi choose to use USB A on its body, the port is kind of big on it, and the
    extension cable for computer connection look bulky on it.
    The picture below shows how USB cable compare with xDSD body.
    Choosing UAB A so it can be connecting to OTG/CCK cable directly, so it is supposed
    to be good on mobility.


    connection and function
    To save space on such small body, many function and setting have to combine different
    buttons, it feels like you are playing code cracking to get to certain function.
    iFi xDSD has load of functions, so its usage takes a little more time to get use to.

    Fortunately, its cheat sheet clearly explains everything steps by steps so one can
    just look for needed function on it and follow the steps.

    To use line out mode might be the most complicated one above all others, but it is
    still manageable to follow, but it took me a few trys to switch it off though.

    Sound Quality
    Bass: xDSD can go low and with quantity, punch and quality is good,
    I could not hear much difference between xDSD, Q5 and S2.
    Both bass enhance switch on xDSD and Q5 don't make bass better on Z1R,
    so I mostly listen with them off.

    Mid: xDSD is sweeter with femal vocal, S2 is also good, Q5 might be a bit harsh, but my Q5
    is still new, probably will change in the long run. While this xDSD has been opened up
    by all members in the tour, I believe.

    High: I use Kenny G's Soprano for this test, and I like xDSD over S2, Q5 is on par with xDSD.
    Probably has something to do with amp power as S2 is not as powerful as the other 2.

    Sound Stage
    All 3 sound forward with vocal, has some depth, width better than depth, layer of instrucments
    is just fine.
    But note that I use closed back headphone, so I don't expect much about stage.
    No clear winner in this department.

    Q5 is obvious robust with its material, and I like the weight on hand, which feel just right
    to me. xDSD has better size for portable use.
    I also found that all 3 units have separated power port, it seems a trend of small dac/amp design
    as one USB port is hard to handle power and data at same time?
    My S2 must have a USB power connected otherwise it will causes the data USB port shutdown on my laptop,
    it is inconvenient since it has no power on/off switch on it.

    My only complain for xDSD is its cables, as its body is small and its cable becomes like over size tail.
    The goods on xDSD are its versality for different usage, and its extreme DAC capability
    to support PCM768KHz/DSD512/MQA, bluetooth, plus powerful ampilifier output, these left
    nothing to be wanted for a portable dac/amp in the marcket.
    Overall, all 3 dac/amp in the comparison are very similar on sound performace.
    Q5 has better feeling on hand for its material and construction.
    S2 has similar DAC spec. but less driving power, its supports MQA decoding on it.
    The xDSD supports MQA but it only does rendering, if you connect to Tidal you will have it.
    As portable Dac/Amp, xDSD pretty much handle all your needs, a very good solid design one.


    1. Hinomotocho
      Great review thanks - have you any further opinions between the Q5 and xDSD now they have settled in and you've maybe spent more time with them?
      Hinomotocho, Oct 3, 2018
  6. Wiljen
    ifi Audio xDSD - tiny packages deliver big time!
    Written by Wiljen
    Published Aug 14, 2018
    Pros - DAC Support for up to 768 PCM, 512 DSD, and MQA, power to spare for use with full sized headphones, excellent Bluetooth connectivity
    Cons - no analog input, notable hiss with sensitive in-ears
    The iFi xDSD was sent to me as part of the review tour so my impressions are limited to 10 days use and I cannot speak to the longevity of the device. Thank you to Lawrence and iFi Audio for giving me the opportunity to put the xDSD through its paces.

    The xDSD arrived in its retail packaging which consists of white slip-cover box with the device, a cloth bag, and the accessories hiding inside. If you have seen pictures of the xDSD, you probably have the wrong impression of its size. I know I expected the device to be larger than it was and much closer to the size of the other ifi products. In ifi speak, you have the Micro, the Nano, and the xDSD can be thought of as the pico. It is about the same thickness as a smartphone in a protective case and roughly ½ the height. Other devices in the same size range are the Mojo and the Fiio Q1.

    The Accessory kit comes with a selection of cables including a USB-A male to female cable for attaching the xDSD to a computer. A USB-A male to micro USB male to attach to charging port, and two different styles of USB-A female to USB-B female adaptors. A cloth carry bag, and Velcro connectors to attach the xDSD to a phone along with a warrantee card and a quick start guide complete the kit. The only thing you really need to add to the kit is the Iphone connection kit or a USB OTG cable for use with android devices.


    The bulk of the case is metal with a polished faceplate and shell in titanium grey. The rear faceplate is a matte black plastic and is about 3 times the thickness of the front plate. Ifi’s documentation says the plastic rear cap was to improve wireless performance and that it performs substantially better than the all metal cases tested. This helps explain a choice that might at first seem an odd aesthetic to some. The faceplates are held in place using two star-head screws mounted on the outer edges. The device has good heft for its small size and feels extremely solid with no wobble or play in any of the connectors. The metal surfaces are very prone to finger prints and smudges so if that bothers you, you might want to have the aluminum case duracoated.


    The xDSD crams a lot of features into a small package for sure. At the core, it inherits the Burr Brown Dac of the Black label series and adds a custom op-amp (OV4627) for the output section. This gives the unit a very capable dac with PCM up to 768 and DSD up to 512 support. This alone puts it at the top end of the specs when compared to most portable dac/amps. In addition, the xDSD supports MQA so regardless of your file type choice, the xDSD pretty well has you covered.

    In addition to USB or Spdif inputs, the xDSD supports AptX and Bluetooth connectivity both as source and as target so you can attach your cellphone to stream tidal or spotify and attach your Bluetooth headphones so you can listen completely wirelessly. The downside to this arrangement is that battery life on the xDSD gets commensurately shorter with each Bluetooth connection. With both the HTC m9 attached as the source and a set of Mixcder MS301 over-ear Bluetooth headphones attached as the target, battery life on the xDSD was decreased to roughly 5 hours before needing a charge. The xDSD does have a micro-USB charge port so it can be attached to a power bank to increase the usable life between charges, but this kind of defeats the purpose of being completely wireless only to have to have wires for additional batteries.

    To adjust the sound, you have the options of 3D+ and Xbass+ as well as the measure or listen options provided by the digital filters. The measure/Listen function exposes the digital filters of the PCM1793a chip itself and lets the end user choose between minimum phase Bezier filter (Listen) or linear phase transient aligned filter (Measure).
    In addition to the features you can see from the outside, the xDSD sports ipurifier, and iematch components internally as well as a battery management system that Ifi refers to as Cyberdrive. The xDSD sports an output impedance of less than one ohm (matching the earlier ifi nano BL) but uses the cyberdrive power management instead of its predecessors direct drive system.



    From left to right on the front panel, you have the 3.5 TRRS balanced connector. This connector works for both Single-ended TRS connections or 3.5mm TRRS Balanced connections. With 4.4 and 2.5mm connectors both more common than 3.5 balanced the addition of a 3.5 to 2.5 adaptor would be a welcome addition for those of us with lots of 2.5mm cables an no 3.5mm TRRS options. (I used a Trinity Icarus III to test the 3.5mm balanced since it was the only 3.5mm TRRS connected headphone in my inventory).

    Next toward the center is a pair of LEDs The upper is the Khz LED and displays one of seven different colors to let the user know what type of input is being received by the xDSD. The LED immediately below the kHz LED shows the input type and displays a different color or pattern for USB, Spdif, and Bluetooth inputs.

    The central volume knob actually serves several purposes. It is the on/off switch, the input mode selector, the volume adjustment, and the volume indicator LED which displays different colors for each decibel range and for Line out functionality.

    To the right of the volume knob are two more LEDs that display the status of 3d+ and Xbass+ followed by a button to turn the two features on or off. In addition, pressing and holding the button in puts the xDSD in pairing mode for Bluetooth as well.


    On the rear face from left to right, you have the spdif input (note this is not an analog input), followed by a recessed USB-A male connector for USB input. I really like this connector as it is much less prone to damage from stress on the connector but it does limit the size cable that can be used and I did have one USB-Otg cable that I had to shave the hood down slightly to get to fit properly.

    Next in line is the digital filter switch for measure/listen. Worth noting is that the function of this switch is slightly different with DSD input when compared with PCM input so a bit of study and A/B testing with your files may be needed to find the best setting for you. DXD and MQA both have fixed filters and you will see no difference based on which position the M/L switch is in.

    Finally at the far right is a charging only micro-USB port. This can be used to charge the device while it is playing via spdif or can be used to charge the device when using the BT mode. I found that when both the main USB connection was attached to a device via USB-otg and the micro-USB were hooked up, the current draw was from the micro-usb circuit, but when the Main USB connection was attached directly to a computer or to a device without using an OTG cable, the main USB port became the power source for the device and the micro-USB port was essentially ignored. (This determined using a DRAK ammeter designed specifically for USB).


    Bluetooth on the xDSD is another mixed blessing. It supports AptX but not AptX HD so it may not be future proofed enough for some, but Ifi took the time to use their internal Burr Brown DAC instead of the Qualcomm’s dac which does improve the sound quality when compared to other Bluetooth devices. I found the range of the BT to be about average with 5 yards being a safe distance and the ability to stretch that distance to 10 yards as long as obstructions were kept to a minimum. Using both a phone and a headphone connected by Bluetooth does cause the battery to run down much more rapidly than wired mode and I found that if I wished to use the xDSD for an entire workday, I either had to run it wired or had to plan on recharging it at my lunch break.


    First off, one would expect that the combination of a <1 ohm output impedance and ifi-match technology would lend itself to use with sensitive in-ears. I found that not to be the case. With the Magaosi k5 a hiss was present regardless of settings. With the Eartech Quint a hiss could be heard with the xDSD turned on but no music playing. I instead found that the Campfire Cascade was a good pairing for the xDSD and did most of my tests with either the Cascade or the Sennheiser HD700.

    Compared to its predecessor the iDSD BL nano, the xDSD is a bit more aggressive with a bit sharper edges. The BL feels smoothed over and less dynamic by comparison. I didn’t find the xDSD overly bright but did find that the upper mids and lower treble are pushed a bit forward and this can be made even more so by using the 3D+. The 3D+, at times, helps vocals sound a bit more lifelike but comes at the cost of being a bit overly energetic at other times and I found I enjoyed the xDSD more with the 3D+ disabled.

    The same held true for the XBass+ which targets enhancing from 100Hz down and had minimal impact with most of the iems and headphones tested. The exception was the Cascade due to its extremely well extended low bass, the difference of XBass on or off was extremely evident. For those of you who know the Cascade, you will also know the last thing it needs is additional bass so again, I left the Xbass+ off for the majority of my listening.

    The filter options are more subtle than either the 3D+ or Xbass+ options but do have a detectable impact. I found the measure to be more to my liking as the listen pushed the upper mids and lower treble further forward than I preferred while the measure kept them inline with the lower mids and provided a more uniform signature.

    Output Power

    The xDSD had no issue driving the HD700 and Cascades but both of those are relatively sensitive and 150 ohm or lower impedance. In order to really push the xDSD, I used a pair of 600ohm Beyer 880s and found the xDSD had more than enough power to push them to levels above what I use for normal listening. The X also had no problem pushing a pair of Fostex T50rp mods so was equally well off with high impedance and low sensitivity cans. I did find that battery life suffered when using the 880s but that has been the case with every portable I have paired with them.


    Fiio Q5 vs xDSD
    384 PCM / 256 DSD 768 PCM / 512 DSD
    More linear more potent
    better when paired with IEMS better with power hungry over-ears
    (assumes use of AM1 or AM3a) (AM5 comes closer to xDSD power)
    No MQA Support

    xDSD vs iDSD Nano BL
    Has Bluetooth 1/2 the price of xDSD
    includes 3D+ and Xbass+ more laidback and warmer presentation
    Separate charge Port 384 PCM / 256 DSD with MQA support
    Supports Spdif input better matched to sensitive IEMS

    The xDSD has a ton of features, but it is its core function that is the real draw. The fact that the xDSD uses its internal dac instead of the Bluetooth chipset for Bluetooth processing means the sound quality comes much closer to parity with its wired counterpart and the sound quality from the wired version is about as good as can be had at its price point. I would put the xDSD on even footing with the Fiio Q5 or the Mojo/Poly combination when taken in total.

    The XDSD form factor is more appealing than the Q5 and smaller and lighter than either the Q5 or the Mojo/Poly combination which will appeal to those who carry it full time. The ability to leave the xDSD in a pocket or backpack and control it from a cellphone and Bluetooth headset is also an advantage.

    The disadvantages are it has no analog input or optical so if you intend to use it with an external DAP, it must support either USB out or SPDIF out. An analog input so it can be used as an amp alone would be a welcome addition as it would add even more flexibility to this already versatile device.

    I found a particularly good synergy between the Cascade and the xDSD when using my laptop as the source. A 14 lbs workstation is a far cry from the envisioned portable devices the designers had in mind, but it works extremely well. For those looking for a DAC/Amp for their small office space (or dorm room) the xDSD offers performance several steps above what the Schiit fulla can offer in about the same footprint with the added benefit of being able to pick it up and take it with you when you travel.


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  7. knorris908
    iFi Audio xDSD - An Updated And Truly Portable Amp
    Written by knorris908
    Published Aug 2, 2018
    Pros - Portability
    Sound quality
    Cost to performance ratio
    Amount of power and battery life in so small a footprint
    Cons - I'm spoiled by menus, so it's off-putting at first to not have a screen list all the options.
    Fingerprint magnet. I'd LOVE a brushed MATTE silver finish like the Micro & Mini lines have.
    My stint on the iFi xDSD tour:

    It's been a while since I've been active, and just when I was lamenting my lost time here on Head-Fi, the lovely chaps over at iFi offered up spots on the iFi xDSD introduction tour. So naturally, I jumped in with both feet!

    So many veterans have already spoken to the specs and features of the device that I thought I'd try something a bit different. When I saw that I was accepted, I decided to try and answer some basic questions that I had about gear when I was first starting out here: "What is it good for?", "What would I use it with?", "Why would I choose this over "x" device?", and as best I could, "Is it truly worth a spot in my kit bag?". So here we go!

    "What is it good for?"
    In my view, the xDSD is a perfect travel companion. I fly often and have many hours of downtime at hospital between emergencies when I'm either on the phone or tapping-out e-mails and processing paperwork. Since I don't have a "static" office, I don't put down roots with more than I can carry. So my entertainment options are understandably limited. I have used the iDSD or iDSD/iCAN stack for a couple of years now, and have been very happy with the performance. (It's not like I would lug something as fragile as a Woo Audio WA6 into a ready-room and feel comfortable leaving it unattended.) It/they stay zipped in my GO bag and perhaps secured in a locker, (when it's an option) when I'm needed on floor. For this, the iDSD/iCAN is IDEAL.

    But what about flights? True, the TSA staff usually chat me up about my iDSD when it shows up in X-rays, and we have a bit of a laugh, but it's certainly not what I would call "compact", and often, I find myself opting to leave something in favor of making room for it/them. (For which I'm RICHLY rewarded with blissful sounds when I finally get to collapse in my hotel room!) Now comes the xDSD. NO CABLES NEEDED. My phone or tablet can be fully-accessible on my tray, and I can leave xDSD in my bag at my feet with just the head/earphone cable running down into it. I can adjust my audio and select tracks simply on tabletop without the clutter of an audio rig piled-on, leaving plenty of room for my laptop, texts, or tablet without feeling cramped, or fearing something falling over the edge. Worth it for that alone!
    And best of all, if you actually manage to exhaust the xDSDs considerable battery run-time, the xDSD will run full-power while it's charging from mains or a sufficient portable battery pack. No waiting!!!

    "What would I use it with?"
    The answer to this is; "just about any gear short of power hungry cans for clinical examination of tracks or components".

    I found the xDSD to be an excellent "all-rounder". It brings fun and excitement to tracks without giving-way to bloated or distorted processing effects on the source. For low-profile, simple listening I adore the old Ultimate Ears Super-Fi 3s and Shure CX300 IIs. The xDSD is dead-sexy with its inky-black noise floor and lively manners. It makes them both punch just slightly above their weight when compared to their sound straight out of my iPhones or Galaxy Note 8.

    The 1 MORE Quad earphones are both spacious and emphasize instrumental pieces as a specialty. I often don't even need the 3D+ or Xbass enabled! And the JVC SZ2000 get driven to skull-rattling lows when I need to feed my basshead sweet tooth. (Low-profile be damned, and the 3D+ Usually turned back on for these sessions.) :wink:

    "Why would I choose this over "x" device?

    In short, I find the xDSD to be an upper Mid-Fi "swiss army knife". It certainly brings out more detail and clarity than my similarly sized FIIO E17. It provides a wider soundstage and greater dynamic range (When used coaxially/SPDIF or USB) than my phones or favorite iBASSO DX90 DAP. Lastly, it is the absolute highest quality audio driver device that I have heard with a sub~$500+ price tag, and certainly, the only one that does all this so well while fitting in a trouser pocket. Silly as it sounds, there is REAL convenience and peace of mind in boarding a shuttle with phone in-hand, but your headphone cable tucked securely in your jacket pocket rather than flapping-about all willy-nilly just begging to get snagged on something or another commuter. Few things suck more than the moment you realize that your cherished headphones are mid-fall towards the "sticky" floor of transit you're on.

    Conclusion: (Took long enough, right?)
    "Is it truly worth a spot in my kit bag?"

    YES! While the xDSD doesn't surpass or supplant my iFi Micro line kit or approach desktop performance, I don't believe that is its point. Would it be MAGICAL for a tiny palm-sized box to equal or best a class-A amp like a Ragnarok, WA7, or BHA-1? Yes! Realistic? Maybe one day, but NOT YET. Same for DACs. But to have MQA future-proofing, FUNCTIONAL AptX & AAC Bluetooth implementation, and near iDSD Micro level hi-res audio performance in a piece if kit about the size of a deck of playing cards... What's NOT to like?

    (BONUS!!! I just learned that iFi is offering MQA support to their other devices going back as far as 2013! Woo-hoo!!) Details & link here at their Youtube announcement:

    Gear used in evaluation:
    Android - Lenovo Yoga A12 tablet, Samsung Galaxy Tab-A, & Galaxy Note 8
    Apple - iPhone 4s, 5, 6, 7+, iPAD "O.G." & Air, All connections via Apple lightning to USB or 30-pin to USB
    Dell - 5675 Desktop, XPS 8500 Desktop
    FIIO - E17 DAC/Amp
    iBASSO - DX90 DAP
    iFi - iCAN Micro SE, iDSD/iDSD BL Micro

    1MORE - Quad Driver in-ears
    AKG - K545 "Mobile Fun cans", K550 "Home FUN cans"
    Beyerdynamic - T1 Ver 2 "My go-to cans for critical listening"
    Bose - QC 25 Noise Cancelling (Cabled & via Bluetooth adapter) "Awesome Noise Cancellation, "meh" sound."
    Etymotic - ER4XR/SR in-ears "My go-to buds for critical listening"
    JVC - (HA-M55X) "Meh bass", Esnsy (HA-SR85) "BOOMY bass", Live Beat (HA-SZ2000) "ULTIMATE BASS"
    Koss - Porta Pros "Surprisingly-good knock arounds"
    Sennheiser - HD650, HD800, HD800S "When the rest of the world needs to go away!"
    Shure - CX300II in-ears
    Ultimate Ears - Super-Fi 3 Studio "Old school fun, but a bit light in the bass department"

    Last questions: "Ken, which of those did you not recommend with the xDSD?" and "Which were the best?"

    No secret here. DON'T expect desktop performance out of a sub 1 pound portable. While the xDSD fully powered EVERY headphone above, The 4 I don't feel that it was able to fully/properly drive are:
    • T1 (Though it got them the loudest of the cans I wouldn't use, it just didn't bring out the depth and detail that I so love them for. Nothing would stop you from hearing music if that is all you wanted, but it defeats the T1's point. Just throw on the K545 in that case. It's infinitely less harrowing to travel with.)
    • Sennheisers - All 3 (Same as with the T1. You'll get sound, but you might as well bring a cheaper/more durable set of cans, or substitute them for the Etymotics or 1MORE Quad driver. You'll get much of the splendid and detailed performance you wanted from the Sennheisers with much less bulk.)
    My favorites that I felt the xDSD brought the best out of:

    • 1MORE Quad Driver (All the sparkle, nuance, and depth that I love these for was there, and it felt like there was still room to go further.)
    • Etymotic ER4XR (Every bit of detail that I was looking for, and doesn't need iFi's XBass to fill out the low end. The sound feels "whole" and not like a jigsaw puzzle where elements are just fitted-in as they come.)
    • UE Super Fi 3 Studio (Breathed new life back into these! They don't sound like much out of my phones, and they don't stack up against the CX300IIs normally, but they wrap you in warm velvet on the xDSD. Also note that while these are still in excellent condition, they are almost 20 years old, so they've been WELL broken-in...)
    • JVC SZ2000 (While They won't make your skull itch like they can on the iDSD or stronger amps, they still make ridiculous levels of bass and sub-bass on the xDSD. So much so that people asked to see and listen to what I had multiple times throughout the week.)

    A special and direct "Thank you" to the iFi tour people who sent out the xDSD for us to take a listen to, and special thank yous to ever-diligent Lawrance, the DELIGHTFUL Karina, and especially the awesome iFi engineers who answer all my hare-brained questions without a second thought.

    Ken N.
  8. Bansaku
    Versatility in a small, powerful package!
    Written by Bansaku
    Published Jul 29, 2018
    Pros - Beautifully detailed and powerful, full-bodied sound!
    Extremely versatile; I officially give the xDSD the moniker of "The Ultimate Portable Swiss Army knife of Audio".
    Cons - Despite some of the best performance I have encountered, Bluetooth re-connectivity is flawed.


    Between updating existing product lines, slapping on coats of anodized black awesomeness, and giving MQA playback across the board, iFi Audio has been busy as of late. So, when the xDSD and it’s tour was announced here at Head-Fi I was both surprised and intrigued. What was this sleek little device and it’s purpose, why the new the “X” branding, just what the heck is Cyberdrive (a buzzword?), and why do I absolutely need to try it? I couldn’t sign up fast enough to find out!

    About iFi

    iFi is a brand born from trickle-down technology licensed from AMR with one simple mission: To provide the absolute best quality ‘Bit-Perfect’ audio from computer generated sources. All iFi products proudly boast clean Class A analogue circuitry with absolutely no digital signal processing; The signal stays true to the source throughout! Since iFi broke into the scene in 2012 they have been making huge waves in the audiophile community, offering products who’s performance is on par with their beautiful, modular and Iconic design! Every product has been carefully engineered for perfect symmetry and synergy with one another, allowing the user to custom tailor their devices to their desired needs.


    I received the xDSD in order as part Canadian leg of the North American tour in exchange for my impressions and review. The words I write are my own and are honest, objective, and free of bias. I received no financial compensation for my effort, only the satisfaction of trying out a quality product for a week.

    About Me

    Born in 1978, I grew up in a family consisting of musicians, broadcaster/sound engineers, and amateur DJs. I always had a deep appreciation and understanding of both music and sound. I was further educated in this self interest after taking courses in both basic electronics and Sound: Electro-Acousto - The Path to Golden Ears. While I believe a listener’s preference in sound is subjective, the science behind it is not. I am not swayed by buzzwords, hype, trends, brand recognition, or big numbers on charts. Opinionated as I am, my words are not only objective but honest. I view all criticism as constructive, as long as it is sincere.



    Official xDSD discussion thread can be found here.
    iFi Audio xDSD webpage can be found here.


    1x Soft velvet carry pouch
    1x TOSLink to mini digital adaptor
    4x 3M Dual Lock adhesive strips; 1 large, 3 thin
    2x USB Type-A female to Type-B female adaptors; one stubby, the other cabled and is designed to fit neatly inside the xDSD’s rear USB port
    1x USB Type-A male to Type-A female cable; used to connect the xDSD to a PC and is again, designed to fit neatly inside the xDSD’s rear USB port
    2x USB Type-A male to Micro-B charging cables; one short, the other slightly shorter… why?


    boxF.jpg boxR.jpg

    Like all of iFi’s products, the xDSD comes with a plethora of accessories. Everything you need to get things up and running is included. While it would have been great to include a USB OTG cable, considering the fact that iFi recently released their own audiophile quality OTG dongle (and reasonably priced at that) I can understand why they chose to leave one out. As for an included iOS compatible USB Lightning cable, there really is no mystery why they’d leave one out; Why pay Apple for Mi-certification when at best, only 50% of the users would use such a cable. Honestly, a smart move on iFi’s part for both the OTG and Lightning cables.


    If one is familiar with iFi’s products, the first thing they’d notice is how the xDSD’s design is a radical departure from the iconic look of their micro and nano lines. Gone is the iconic angled anodized aluminium body, the xDSD sports a compact and stylish 6063-T5 aluminium-magnesium alloy casing with the rear of the device capped off with a matte black plastic, taking on a size and form factor more similar to a standard portable DAC/amp.


    The front of the xDSD is a very minimalistic design. There is a single S-balanced 3.5mm jack and four small LED indicators, kHz/Input on one side, 3D+/XBass+ on the other, in the middle lays the Cyberdrive knob, illuminated with a multi-colour LED that indicates both function and volume level, while off to the side sits a multi-purpose Settings button. More on Cyberdrive and the front’s functionality below.


    The rear of the xDSD houses what you’d expect: a digital S/PDIF mini input, USB Type-A input with a large enough opening to fit dongles such as the Apple CCK or USB OTG, the Filter toggle, and a USB Type-B mini jack with LED indicator for charging the device.


    (Bonus points if you know the reference)

    One thing that always impresses me about iFi products is how much technology the cram into their micro and nano devices, and the xDSD is no exception! Take a look at the pictures below; Nicely done iFi!

    xDSD-PCB03.jpg xDSD-pcb08.jpg xSDd-PCB024.jpg xSDd-PCB025.jpg



    Not merely a buzzword invented by iFi to sell a product, Cyberdrive is the brains of the xDSD and deserves it’s own section! The all new circuitry allows all analogue functions (volume, amplification/sensitivity, and the battery) to be digitally controlled! Incorporating the iFi exclusive OV4627 ultra low noise FET input Op-Amp and W990VST digitally controlled stepped attenuator (the analogue volume signal is broken up in 101 1dB steps), Cyberdrive technology allows for the xDSD to deliver eardrum splitting power to difficult to drive full sized over-ear headphones, while at the same time providing deadly noise free silence to sensitive IEMs! Cyberdrive detects the impedance of the headphones in use in and adjusts on-the-fly so the user simply has to plug and play without any hassle of switching or enabling anything!

    Not content with keeping things to just the amplification, Cyberdrive technology extends to the battery operations as well. The xDSD draws power from a separate micro USB charging port, meaning that when connected to a smart device via USB no power will be drawn when in operation from it’s host! It doesn’t end there either. When connected to a PC, the xDSD will still draw power from either the battery or the 5V micro USB, thus eliminating the possibility of excess noise traveling through the USB cable from the power supply or motherboard! Even better is that when the battery is fully charged, the Cyberdrive circuitry will automatically disengage the 5V charging signal while still powering the xDSD! A lot of battery operated devices these days will continually do a damaging and potentially dangerous dance of charge/drain when connected to an external power source. They are (despite their moniker) not smart enough to simply disengage the battery charging when at a full charge and power the device straight via the 5V power signal. Instead the device will still draw it’s power from the battery while its being charged. This cycling will create excess and unnecessary heat which in turn will cause a slow degradation of the battery’s capacity to fully charge, not to mention a hazard of catching fire and exploding! Cyberdrive does battery charging right!


    With the growing number of headphones incorporating a balanced connection, iFi included the option with the xDSD. What makes iFi’s implementation of a balanced connection so special is that they incorporated it into a single 3.5mm jack that is capable of accepting a non-balanced plug and not cause damage to the amplifier! I’d like to know what old gods the engineers over at iFi pray to as this is a seemingly impossible feat to accomplish! What’s more insanely impressive is the fact that S-Balance technology also benefits un-balanced headphones, giving them performance that approaches a true-balanced connection! Mind-blown!

    Besides having a combined 3.5mm un-balanced/balanced jack, the xDSD one-ups the competition yet again and throws in a true line-out option. Most hi-end DAPs and portable DACs have a line out option, sure. However the line out always has it’s own separate jack (and more times than I can recall not at a fixed volume either), with a second for headphones. What makes the xDSD special and excel over it’s competition is the fact that iFi combined the 3.5mm out into a volume controlled un-balanced/balanced headphone with a true fixed level line-out jack; the xDSD can ether transport audio through it’s amplifier, or bypass it, the volume, and the XBass+/3D+ option and output the signal to a universal > 2.1V @ 0dBFS line out format, all from a single 3.5mm jack! One jack, three types of output!

    Initial Thoughts/Impressions

    Upon gazing upon and picking up the xDSD for the first time, to quote iFi, “ Its dark titanium vacuum ion plated metal enclosure is pleasingly tactile and compact. “ And shiny too… so very shiny… However despite being glossy, I never had any issues with the xDSD slipping in my fingers or losing my grip, thanks in part to the unique (and sexy) wavy form factor. On the other hand, after some manhandling finger prints will be left behind on the casing. I for one didn’t really care, but for others their OCD may be knocking at their door.


    The xDSD is, as one would expect being a portable device, very light weight. Similar sized DAC/amp with metal enclosures I have experience with feel a lot more hefty, and likewise add far too much weight when coupled to the back of smart device or DAP. I was actually a little surprised at how light the xDSD was in my hand. Despite it’s weight, I never got the sense of fragility. Between the aluminium-magnesium alloy casing and high quality plastic end cap, the xDSD feels solid and I am confident the materials will hold up to the test of time.

    What surprised me the most was the centre control knob. I like it! Made of a strong and rugged plastic, the knob has a satisfying tactile feel to it, both in texture and operation. With a slight rise above the casing, the outside of the dial is akin to a gear thus giving excellent tactile grip for easy turning with minimal effort. I thought that this may hinder operation of the potentiometer when the xDSD lays flat on a surface (or on top of my iFi stack), but my fears were quickly eased as the 4 rubber feet on the bottom not only provides enough clearance but gives the light unit excellent (and much needed) grip. The potentiometer itself trades smooth turning found on iFi’s micro and nano lines for a radically different click-style turn. At first I was uneasy about this departure from iFi’s norm, but the more I used it the more I understood their decision to go this route. This not only reduces the risk of having the knob accidentally turned up causing unpleasant and potentially damaging effects to one’s ears, but gives the user tactile feedback. You feel the click, you know the volume has changed as intended.


    Functionality is full featured yet ingeniously minimalistic in implementation. All (manual) operations are controlled by using either the centre Cyberdrive knob, the setting button, or a combination of the two. This eliminated interface clutter as well as eliminating accidental toggling of the functions. Implementing each of the functions could not be easier either. Hold down the Cyberdrive button to power on/off. Volume is (obviously) controlled by rotating the centre knob. To activate XBass+ and 3D+ simply click the settings button to cycle through and engage one or both. To enable line-out mode hold the setting button while powering on the xDSD. To enable/disable Bluetooth mode, rotate the centre knob clockwise while holding down the button when powering on.


    The settings and volume indicators are streamlined and combined into colour coding LEDs. I love this and is simply brilliant! The good folks at iFi decided using colour coding visual cues for the functionality would be a more natural and effortless way for the user to quickly determine what’s what. In our every day lives we humans, above all else, use colour as visual cues. Not words, not symbols, colour. It’s simple, transcends language, and if properly illuminated highly noticeable. As the xDSD is not only a small portable device but dark in aesthetics, it would be cumbersome to try and read either a display or individually labeled switches, and can be a pain in both the time and effort it takes to take out the device and hold it in such a way as to see everything, as well as the physical aspect of straining to see what is set to what. iFi made this simple by combining all the indicators into six colour coded LEDs separated into four zones. They are as follows.

    Battery status - located on the rear next to the USB charge port


    XBass+/3D+ - located on the front right side
    Each of these settings have a white LED indicating on/off. Pretty simple.

    Input - located on the front botton left


    Audio Format (kHz) - located on the front top right


    Cyberdrive Rotary Control - located in the front centre



    Unless specifically noted, all performance impressions have been averaged between the headphones used:

    Sennheiser HD 600, Momentum (1st gen.)
    PSB M4U 1
    Meze 99 Classics
    AKG K340, K240 Sextett/Monitors, Q701
    HiFiMan HE 560

    Polk Nue Voe
    Meze 12 Classics

    Bass - Neither accentuated nor underwhelming, the bass is response is relatively neutral and under control. Mid-bass is nimble and weighted enough to give transients an excellent slam while accurately rendering the lower frequency response as to provide nuanced detail without overwhelming the rest of the spectrum. Sub-bass ruble is decent, though not overwhelming in quantity. It is what it is and gets the job done, nothing more.

    Midrange - I wouldn’t say the response is forward, but it certainly take centres stage compared to the rest of the frequency spectrum. Rich with good texture and body, vocals and instruments alike come across as organic, smooth, and natural. The midrange detail is impressive for such a small device. While I never had any trouble picking out the micro details of a recording, they were not very forward in their presentation. Not a negative in my opinion, however there are some who clammer for these details to pop.

    Treble - Great extension and transparency, yet not bright nor aggressive. The treble is controlled and articulated enough provide excellent detail, however it’s presentation does lack a touch of air. Performance wise nothing is lacking or out of place, and much like the bass region it gets the job done.

    Soundstage/Imaging - The xDSD’s soundstage is not the largest nor the smallest; I am sensing a trend here. Much like the frequency response, sound-space is pretty neutral though accurate in presentation. Regardless if I was listening to a live recording performed in an intimate closed in modern venue or a wide open 16th century gothic Church, the xDSD’s sounded natural and correct. Imaging was excellent, with superb separation. I never got the sense of clutter nor did I ever have a hard time picking out 3D cues.

    XBass+/3D+ - It wouldn’t be an iFi product without XBass and 3D+. As their names imply, the former gives a bass boost while the latter increases the soundstage. What makes these features stand out above the competition is that they are not a DSP effect, rather they are 100% analogue filters, and the implementation of each of these features is fantastic. XBass+ give a gentle nudge in the lower frequency response, not enough to turn a pair of HD 600 into bass cannons, rather just enough to give something like the Q701 the boost needed to fill out the lower end. Likewise, 3D+ is not overwhelming nor does it sound cheap. The increase of the sound space is subtle, but is enough to give music a more airy and expanded sound without sounding un-natural. All in all, quality over quantity!

    Amplification/Sensitivity - With regards to the full size headphones used, the xDSD had no trouble powering my most hard to drive cans to acceptable levels. For standard 32 Ohm headphones with moderate sensitivity such as the Meze 99 Classics or PSB M4U 1, the xDSD provides deafening amounts of power while maintaining coherency and control. Moving up the impedance chain to 300 Ohm, with excellent grip and control, the xDSD handled the legendary Sennheiser HD 600 with grace and ease while still having ample power in reserve. With more demanding (fussy) headphones such as the AKG Q701 and HiFiMan HE 560, the xDSD was able to drive both sets to acceptable levels though in some cases, while rare and mainly in regards to DSD files, volume did have to be nearly maxed out to achieve what I would consider moderate a volume level. Super high impedance headphones such as my AKG K240 600 Ohm Monitors and K340 400 Ohm x2 Electrostatik/Dynamic hybrids, well, lets just say it was an admirable attempt by the xDSD to try and power them big boys. 24mW @ 600 Ohm is not nearly enough juice for fussy high impedance AKGs, and alas the xDSD met it’s match.

    As for sensitivity with IEMs, the xDSD absolutely destroyed the notion of hiss and distortion! While the only two IEMs I own are the Meze 12 Classics and the Polk New Vo, both are relatively sensitive with the former being 16 Ohm @ 101dB sensitivity, and the latter being a balanced armature driver. No matter what amount of volume was required for each IEM in respect to the source track, both IEMs displayed absolutely no hiss, no buzz, no breaking up of the sound, simply a smooth effortless rendering! It’s one thing to provide a black background while simultaneously supplying sufficient power for larger cans, but to do so for IEMs as well without the aid of a switch or dongle is impressive!

    Speaking of a black background, my testing would not be complete without the playing a lossless “digital black” file, a track composed purely of nothing! Why play such a track you might ask? Simple really. When a powered on device is idle, it should (in theory) have a solid black background. For the most part the circuitry is inactive, hence the silence. To fully gauge how silent or black the background truly is the circuits must be active and the only way to accomplish this is to push music through the device. However, music is music and not silent. This is where a file containing nothing matters. It essentially activates the signal path without producing sound, thus enabling the user to precisely hear any potential hiss or hum. In regards to the xDSD, even at full volume, regardless of the headphone or connection type used, the background was completely silent. Nothing from the amp, nothing from an outside source, simply blackness!

    Listen/Measure - This is a feature iFi recently started including in their product line-up, and like XBass+ and 3D+ is becoming a staple. I always found this filter toggle intriguing. What this switch does is change the latency from “minimum phase” (Listen) to “linear phase” (Measure). In short, with linear-phase filters the phase-shift is linear across frequencies however it will introduce “pre-ringing”, whereas minimum phase filters implement a lesser delay time but can introduce phase distortion artifacts. Basically, what this does to the sound is give you the option of either shaping the sound to become more neutral with Measure, or give the sound a little more excitement through an optimized transient response with Listen.

    This was not my first time experiencing phase shift as I have messed around with software latency previous, so I did have somewhat of an idea as to what to expect. The effects of the toggle ranged from subtle to noticeable, depending on the track in play and the headphone used. There really is no right or wrong way to go, it is all up to the user and their preference and easy enough to toggle between the two settings. What I did find is that selecting Measure helps alleviate a headphone’s “house sound”, whereas selecting Listen helped breathe some fun into headphones of a more neutral nature. When I paired the xDSD with the 99 Classics I like to select Measure. This helps bring down and give greater control to the somewhat prominent bass response. When listening to the HE 560 I would choose Listen as this gave the ruler flat low end some much needed extra slam.

    Summary - One might conclude from my description of the xDSD’s sonic characteristics that the sound might be somewhat lacklustre. This is not the case, rather that was me being objective. With respect to the xDSD sound it holds it’s own against it’s competitors in the same price bracket, and those costing many times more. I recently had the opportunity to test-drive the Sennheiser HDV 820 for a month, along with Sony’s flagship NW-WM1Z DAP (my brother has too much money) and in all honesty, the xDSD was not that far off in performance. Smooth, detailed, effortless, elegant, and powerful, no matter what track I threw at it, no matter what headphone used, the xDSD made short work of the sound and rendered it to near perfection! To my ears, the xDSD is pure sonic bliss!


    What makes the xDSD so great is it’s flexibility in connectivity to modern digital devices. With so many option available to the end user whether on-the-go or at home, the xDSD is quite possibly the most versatile audio transport device on the market! It’s time to put the xDSD through it’s paces! While I tried to cover a wide range of uses, it merely represents my personal experience. As always, your millage may vary.

    DAC - Sporting the highly respected multi-bit DSD1793 Burr-Brown chipset, the xDSD makes an excellent option to use as a stand-alone DAC. Without a doubt, the Burr-Brown chip is leagues ahead of the ESS Sabre chip, effortlessly revealing the subtlest of detail while delivering excitement and emotion all while retaining a sense of liquidity throughout the frequency spectrum! With the aid of the micro iTube2 coupled with the micro iCAN SE, I replaced my micro iDAC in my stack with the xDSD and started down a journey of re-appreciation. Rotating between headphones, I spent hours sitting at my desk going through my favourite tracks. Needless to say, it was very difficult for me to unchain the xDSD and move the micro iDAC back in. 7 years of DAC evolution between the two chips was a real eye opener!

    Bluetooth - AptX and AAC at it’s finest! Well, performance wise that is. Connectivity wise, well, I’ll get to that. First, the good. Quite honestly, I am a wire loyalist. In my experience nothing beats a hard wire connection. It’s solid and it’s reliable, and most importantly, it’s lossless. I haven’t made the move to Bluetooth because the audio quality just isn’t there. Much like USB was, Bluetooth audio still has a long way to go. The xDSD’s Bluetooth performance has changed my mind.

    Absolutely, without a doubt, the xDSD’s Bluetooth audio quality is near perfect, and unbelievably so! Hard as I tried, when listening to both ACC and AIFF tracks I could not tell the difference between wired and Bluetooth! It got to the point where durning my testing downtime I stopped using the CCK with my iPod touch and went purely Bluetooth. Every nuance could be heard, and the tonality remained as neutral as if it was connected via USB or S/PDIF! iFi wizardry I tell you!

    In regards to both the range and connection strength, I encountered zero issues. Absolutely none! Once connected, with my iPod touch stationary in the living room on the coffee table, I was able to move around freely between all 3 levels of my townhouse without any loss of the signal. Moving the iPod to my basement yielded similar results. I could be on the top level with two floors and bedroom walls in-between the myself and the source yet the xDSD did not skip a beat. I was even able to go outside and do work in the front and back yard, even go down to the dumpster (which from my living room is probably close to 40’ away) and the connection remained solid, no word of a lie! My cordless phone doesn’t even have half the range nor clarity at distance, and it uses DECT 6.0 technology!

    The last bit of Bluetooth goodness comes in the form of pairing. If the xDSD is in Bluetooth mode it will search for a previously paired device and connect when found. If the Bluetooth device is new to the xDSD, it can be 'force paired' by pressing the 'Settings' button for 3 seconds. Easy breezy! Pairing really couldn’t be more simple. Once paired with my iPod the xDSD was remembered as a connected device, and would subsequently without any issues… almost. Now for the bad.

    Before I go ahead I have to say that what you are about to read is the xDSD only issue/flaw I encountered, and in my opinion one that absolutely needs to be remedied. While pairing the xDSD with a Bluetooth enabled device is easy and straight forward, it is not without an annoying snag. Regardless of using the 3.5mm jack as headphone or line-out, when switching from wired mode to Bluetooth after pairing has already occurred and the device is has previously streamed audio flawlessly, the xDSD will not output ANY audio. Neutron and iOS recognized the xDSD and states that it is paired (and seemingly working fine), yet regardless of the output type no sound can be heard. To fix this I simply had to go into the Bluetooth settings in iOS and forget the device (iFi Audio), and then re-press the ‘Settings’ button for 3 seconds for the xDSD to be re-discovered. I had to do this literally every time I switched between line-in/Bluetooth when previous it had worked fine. Sure, it is only seconds of extra work consisting of a few swipes and a press of a button, but the fact remains that this should not be necessary.

    Line Out - As pre-mentioned, the xDSD sports a true line-out. This adds ultimate versatility. So many possibilities, and I paired the xDSD to anything in my possession that had an input. While I won’t overwhelm you with the task of reading my mundane (yet fantastic sounding) results, below is just a small list of what one can do with the xDSD.

    One can easily stream and control audio through their smart device to a bookshelf stereo or a home theatre system. Perhaps you need greater amplification, connect the xDSD to more powerful desktop headphone amplifier (such as a micro iCAN SE or iTube2). Even through most new vehicles having Bluetooth pairing, in many cases only for voice and not audio streaming. Solution: Connect the xDSD through the vehicle’s 3.5mm/RCA in! Heck, one can even forgo a fantastic sounding portable sound-brick’s sub-par or outdated Bluetooth and line in from the xDSD providing both superior sound quality and range, as well as saving on the speaker’s battery! The list of possibilities goes on and on!

    USB - PC & OTG/CCK - What can I say, they just work! Connecting to a PC is a simple as connecting the included cable to a free USB port. What makes the xDSD a cut above the rest is the inclusion of USB 3.0 connectivity for a superior connection over the USB 2.0. The inclusion of iFi’s femto precision GMT Clock and intelligent memory buffer system derived from AMR Audio’s USD $5,500 flagship DAC products eliminates jitter, thus providing an exceptional listening experience! The majority of my listening experience was done using USB, and I can say the transport is solid! I experienced no hick-up that normally are associated with USB audio. On a plus, the xDSD is fully compatible with iFi’s recently announced iPurifier3; USB 2.0/iPurifier2 users need not worry, the xDSD will work just fine!


    Whether using my 6th gen. iPod touch, or my co-worker’s Galaxy S9, both devices worked flawlessly with an OTG/CCK. Using Neutron on both iOS and Android, the xDSD showed up under the Audio Hardware options menu, and I had full Hi-Rez and DSD transport! Thanks to the xDSD’s built in battery, there was absolutely no excess power drain on either smart device, at least none that I could detect. On a side note, my co-worker was blown away at how much better the xDSD sounded over his flagship phone! I love it when someone hears true quality audio for seemingly their first time.


    S/PDIF - Having the ability to accept both optical and coaxial signals, this is a extremely useful feature to have, and I am glad iFi included this input. For most, I would assume the biggest use of this connection would be to pair the xDSD to a high end DAP. I however do no own such a device with that output. What I do own is a S/PDIF booster and 15’ of fibre optic cable running under my floor linking my PC via TOSLink to my home theatre receiver. Perfect! Here’s why.

    One major problem I have making use of my micro iTube2 with my stereo is the fact that I have to do some pretty cumbersome USB and RCA cabling across my living room, bridging it halfway to my iDAC which in turn is linking off a USB hub extension, all just to reach! Needless to say, the micro iTube2/stereo combo doesn’t get much, if any use. Enter the xDSD! With little effort I was able to simply unchain the micro iTube2 from my desktop stack and hook it up by my stereo! By having a set of short RCA cables plugged into my receiver and an iPower near by, it was a simple process to connect the xDSD via S/PDIF and line-out to the micro iTube2, and in turn it to receiver’s discreet RCA input and presto, musical bliss without ANY excess mess! Everything is neat and tidy, and sounding fantastic! Booya!

    MQA - My only experience with streaming audio is through Spotify, and that’s only while at work. I tend to stay away from streaming due to the fact that my audio gear reveals too many flaws associated with streaming. However, because I had to put the xDSD through it’s paces I did sign up for Tidal and hear for myself what all the fuss is about surrounding this new MQA streaming format. Using Audirvana as the transport, I proceeded to building a playlist of MQA tracks. From the moment I pushed play, I was blown away! The MQA tracks sounded remarkably similar to my AIFF copies, and the xDSD decoded them with sonic perfection without any hiccups along the way!

    While personally I have no use for MQA streaming (yet), I can most certainly see a future ahead for codec! As more and more tracks are added, I can see how having truly lossless streaming audio of thousands of songs that are available at your whim would be appealing to the end user. Kudos to iFi for having forward thinking and not only having the xDSD natively handle MQA decoding, but updating your existing lines well!

    Battery Life

    iFi claims the xDSD’s 3.8V/2,200mAh Lithium Polymer battery provides 6-10 hours of playback, depending on the transport type; 10 hours for S/PDIF, 8 hours for Bluetooth and 6 hours for USB. While I only roughy eyeballed the time throughout my various testing, I can not call them on their claims. The only thing I can say is that the xDSD’s performance is in fact, as advertised. If anything, I got slightly greater battery life using USB and line out, achieving closer to 6 1/2 hours.


    iFi gives the xDSD the option of two official firmware choices. The pre-installed version is v5.30, which has been optimized for MQA playback. This limits the user to a max sample rate of PCM384/DSD256, which for the vast majority of us would be more than sufficient for our libraries. Firmware v5.20 enables the xDSD to decode sample rates up to (an overkill of) PCM768/DSD512, however this will disable native MQA playback. While the choice is yours as to which firmware version best suits your needs (and is a great option to have), I have a feeling that most of us will simply not bother to mess around with changing the default install.

    As for the drivers, things couldn’t be more simple, no matter what platform you are on. macOS/Linux need not do a thing; Connect the xDSD via USB and you are good to go. In Windows, a simple download of the USB drivers and install is required, followed by a restart. With today’s modern systems, we are talking about 1 minute time. Once installed an iFi menu tray icon will appear where you will be able to adjust ASIO settings, and of course full functionality from within the Sound Control Panel.


    In my review of the micro iTube2, I stated that it was the Swiss Army Knife of pre-amplifiers. Well, I think iFi has outdone themselves (yet again) and created a new contender for the moniker with the xDSD! With respect to audio transport, what can’t it do, and at $399, what’s not to love? The xDSD literally has all of your bases covered! Beautiful yet rugged design, a powerful headphone amplifier with analogue volume output that can be used on-the-go or at home, USB and digital inputs with a separate power connector for the cleanest sound, fantastic implementation of bass and soundstage enhancers that don’t sound gimicky and actually enhance, S-Balanced 3.5mm out with the option of true line level output, MQA and DSD decoding, and probably the cleanest the purest Bluetooth audio I have had the privilege of experiencing! Once again, iFi managed to deliver a plethora of cutting edge trickle-down flagship technology and performance in a compact device and offer it at a price that screams “ Shut up and take my money! “


    My time with the xDSD was nothing but a joy, and I feel truly privileged to have be able to experience all that it had to offer. Whenever I get my hands on an iFi product they always blow my expectations, which is why I not only own several myself, but will continue to look to them for future upgrades. They have a bad habit of releasing a product I never knew I needed, and the xDSD is no exception. I was blow away with the performance and features offered by such a compact and extremely sexy device. My hat’s off to you again iFi, keep up the awesome work, our ears appreciate it greatly!
    1. Koolpep
      Well done review! Thanks!
      Koolpep, Aug 6, 2018
      Light - Man likes this.
  9. Mightygrey
    A real ‘Swiss-army’ trans-portable DAC
    Written by Mightygrey
    Published Jul 24, 2018
    Pros - Form-factor + build-quality
    Range of connectivity + file compatibility options
    Power and transparency
    Excellent Bluetooth sound
    Cons - Chrome-finish is a fingerprint/smudge-magnet
    Controls not immediately intuitive
    Some bluetooth pairing 'hiccups'
    Cheaper little-brother Nano BL is curiously a better desktop prospect
    iFi are on a veritable roll in the mobile DAC+amp stakes. Having cornered the market between the stupendously-powerful Micro Black Label, and recently landing a more budget-conscious win with the Mojo-challenging Nano Black Label, they’ve slotted the xDSD squarely between those two products, splitting the difference price-wise and performance-wise, while adding Bluetooth and an all-new form-factor in the equation.

    Screen Shot 2018-07-24 at 7.02.29 pm.png

    iFi kindly arranged a head-fi tour for users to give feedback and reviews of their latest device, which happily included Australia and New Zealand - so I gladly took the opportunity to spend a week with the xDSD, and see how it performed in both desktop, and on-the-go duties.

    What’s the pitch?
    It’s a $589.95 (current Australian retail price) portable headphone DAC & amp, which includes some pretty impressive features. I won’t copy & paste the entire warts-and-all specs of the device (I’m more than confident you can manage to find these on their website if you’re interested), but the parts that interested me included:
    • Connectivity: USB; Optical (a step-up from the Nano Black Label and something I do genuinely try to use where possible); and proper aptX (great for me as an Android user) / AAC (great for you, if you’re an iOS user) Bluetooth
    • File-handling: up to 22.57MHz* DSD and 768kHz/32Bit* PCM (I can count the number of 192kHz albums I own on one finger, but this sounds impressive)
    • Power: 500mW @ 16 ohms, 48mW @ 300 ohms (a relevant figure for Sennheiser HD 580/600/650/800 users out there).
    • Line-out mode: for use a a stand-alone DAC (I do like to use portable DACs in conjunction with my two-channel set-up)
    …and a few features that weren’t really of much interest to me, but of course, might be to you:
    • Full MQA compatibility: (I won’t really dwell on this, aside from saying that it’s a solution for a problem I don’t really think exists and creates proprietary hardware + software problems)
    • ‘Listen’ & ‘Measure’ filters: I certainly don’t plan on doing any ‘measuring’ for pleasure, nor do I plan on critically trying to split them apart (spoiler altert: I tried briefly, and couldn’t)
    • Balanced 3.5mm headphone out: I don’t own any balanced cables or gear, and can’t really say I need it.
    • ‘3D+ Matrix’ & ‘XBass+’: I figure that using hardware to change the signature of your headphones is a very expensive way of EQ-ing them. I don’t really tend to EQ, but have occasionally dabbled in Roon parametrically.
    [​IMG] Screen Shot 2018-07-24 at 7.01.29 pm.png

    What’s in the box?
    The same paraphernalia as the Nano BL, actually:
    • A nice velour carrying-case (cosmetic, certainly not drop-proof)
    • A rather-long full-sized USB 2.0 cable for data transfer
    • A couple of obscure-looking and irrelevant USB adapters (which I suspect would be of far less use that including Lightning / USB-C OTG cables…)
    • A TOSLINK optical adapter
    • Some 3M ‘Command’ strips for connecting to phones/DAPs
    Screen Shot 2018-07-24 at 7.02.20 pm.png

    Mobile users might be left scratching their heads as to why some kind of on-the-go cable isn’t included, but given the likely audience split between Lightning/USB-C/USB-Micro connectivity, iFi leaves that up to you. So be warned, if you don’t have one of these you won’t be playing it straight away (wired, anyway).

    How’s it put together?
    Well for starters, if you tried walking into a sporting stadium carrying the xDSD a security guard might be forgiven for thinking you were trying to smuggle-in a hip-flask of booze! The polished chrome finish and shape certainly gives-off that impression, and the centrally-located round volume pot certainly adds to it. It looks super-cool and premium…but touch it once and it tarnishes immediately with fingerprint smudges. It needs a serious polish with a cloth to buff-out (making it a bitch to photograph!), so if you plan on using it in its intended use as a portable device, you’ll know exactly what I mean.

    Screen Shot 2018-07-24 at 7.03.14 pm.png

    Have you held a Chord Mojo before? Well it’s about the same size.

    Screen Shot 2018-07-24 at 7.02.11 pm.png

    It’s a nicely-built device, in keeping with it’s iFi stable-mates, and has a nice ‘heft’ to it that gives you the assurance of quality craftsmanship. It’s theoretically pocket-able, but when stacked with a smartphone it creates quite the ‘sandwich’ which does mean you’ll be forced to carry it in one hand.

    On the desktop
    I did use the xDSD for all my desktop listening-duties during my week spent with it, and did find it frankly a little tricky to use as a desktop device - the volume-pot is a ‘wheel’ rather than a ‘knob’. This is great for on-the-go use, as it prevents inadvertently wild (and potentially dangerous) fluctuations in volume; but it’s slightly less user friendly on a desktop. Not a deal-breaker, but I just found the Nano Black Label a little easier to use when stationary.

    Also, being a pretty light-weight device the size, heft and tension of the supplied USB cord tended to make the xDSD slide around on my desk at work. It has four little rubberised ‘feet’ which keep the shiny finish from scraping on desktops, but doesn’t provide too much friction otherwise.

    On-the-go: Stacking vs streaming
    During my time with the xDSD I found I spent most time with it powering IEMs via aptX Bluetooth-mode (connected wirelessly to my Samsung Galaxy S9+), with the xDSD sitting in my jacket inside pocket. I did try stacking but found the convenience of Bluetooth easily outweighed the marginal loss in sound-quality. Add to that the ’surface noise’ of life that comes with commuting and general life outdoors, and Bluetooth easily came out on top in terms of pros and cons. I must add that I did find a couple of instances where I simply couldn't get the xDSD to pair to either of my Android devices - I had to 'forget' them and restart the device to get it to work.

    Screen Shot 2018-07-24 at 7.02.48 pm.png

    Actually, I found myself using Bluetooth at home more often that not with full-size cans - it’s just too damn convenient for non-critical listening.

    Screen Shot 2018-07-24 at 7.03.04 pm.png

    I also used it plugged straight into my two-channel system as a source via aptX Bluetooth, controlling via my Galaxy Tab A from the couch, to good effect. A quick A/B between the 44.1 FLAC via the xDSD and vinyl versions of Radiohead’s “A Moon Shaped Pool” did have some slight digital ‘glare’, but otherwise super-enjoyable.

    Screen Shot 2018-07-24 at 7.02.56 pm.png

    User interface & controls
    Like any new ‘toy’, I took the xDSD straight out of the box and started to mash buttons to make it work. Without reading the instructions, naturally. I like to see how things perform intuitively, plus, instructions schminschtructions…right? Anyhow, I didn’t know that I received the xDSD in ‘line-out’ mode from the previous user, meaning that it was set to ‘LOUD’ immediately for headphone use (luckily, I wasn’t wearing the headphones at the time). Switching between regular-mode, line-out mode, and wired/bluetooth mode requires a slight learning-curve in order to figure-out which isn’t immediately intuitive, but easily learnt with practice.

    The volume-pot gives a nice ‘glow’ to indicate volume-level + file-type. Like other devices (looking at you, Mojo), you do work out eventually what colour represents which volume-level…which does change volume-level depending on the impedance + sensitivity of your cans. So like all audio devices, practice caution and sensibility.

    The ’Measure’ and ‘Listen’ filters proved to be indistinguishable to me. That’s all I can really add about that.

    Screen Shot 2018-07-24 at 7.02.38 pm.png

    ‘Bass-boost’ switches were intoxicating to me as a kid. Flicking a switch to be rewarded with +10dB of instantly-audible, distorted flab was my idea of a “good time”. It took me a good decade or two to wean myself off that cat-nip, so I treated the ‘3D+ Matrix’ & ‘XBass+’ switches with caution. When I did tinker with them, I had to seriously concentrate to find any pronounced difference, if anything at all. I did find that it differed wildly depending on what music I was listening to. On Van Halen’s “Panama” (MQA via Tidal desktop app), the 3D+ switch made the cymbals noticeably ‘tizzier’ and wider in terms of spacial-perception, for example.

    Power & headphone matching
    It handled everything I through at it from IEMs to 300-ohm Sennheiser HD580/650’s with aplomb. There’s plenty of power in this little device to drive pretty much anything to deafening levels. It’s powerful.

    More specifically, I spent my time listening with the xDSD paired to:

    • Grado GR10
    • Sennheiser IE800S
    Screen Shot 2018-07-24 at 7.02.02 pm.png
    Screen Shot 2018-07-24 at 7.01.38 pm.png

    Full-size cans:

    • Grado GH1
    • Meze 99 Classics
    • Sennheiser HD580/650
    • Campfire Cascade (briefly)
    • Focal Clear (briefly)
    Screen Shot 2018-07-24 at 7.03.27 pm.png

    Listening & sound quality
    I’m not going to give you a bass/mids/treble/soundstage run-down because I don’t think a good solid-state amplifier should impart any of those characteristics onto headphone transducers, (unless it’s either under powering them; or has dampening/impedance mismatches). Instead, I’ll give you every surety that this device decodes and plays music with absolute transparency and clarity. The Burr-Brown multibit DSD1793 DAC sounds predictably perfect (like a good DAC should), and has ample power for most headphones.

    I will give you a few examples of some musical and gear pairings I tried-out and enjoyed with the iFI xDSD, because music’s there to be enjoyed, not analysed.

    1. Ryan Adams “Prisoner” (MQA via Tidal desktop app) with Sennheiser HD580 Precisions

    This album is one of the most heartfelt ‘breakup’ records ever written, it’s raw, personal, and incredibly powerful. It’s also incredibly well-produced and recorded, and it’s a great test for vocals and guitars, which the 580’s excel at. Amazing separation and “air”.

    2. A Perfect Circle “Eat the Elephant” (aptX via Samsung S9+) with Sennheiser IE800s

    APC’s first album in well over a decade, and if I’m honest a little disappointing on my first listen. The IE800s are so incredibly linear and transparent that it was if anything, a little too ‘smooth’ and didn’t really impart the dynamics I would have liked, but that’s hardly the fault of the xDSD. The bass and impact on my favourite track on the album, ‘Hourglass’ was pretty impressive and nicely textured. I had to play this album via loudspeakers to really enjoy it.

    3. Snail Mail “Lush” (aptX via Samsung Galaxy Tab A) with Grado GH1

    Easily one of my favourite records released in 2018 thus far, and being guitar/vocal-driven rock sounds incredible over the Grados. The Grados also happen to be less-than-forgiving on poor source material and can have a harsh/fatiguing top-end. I forgot that I was listening via Bluetooth to this record, which is full-praise for how the xDSD acquitted itself on the wireless-front.

    4. Father John Misty “God’s Favourite Customer” (FLAC via Roon) with Sennheiser HD650’s

    Ok, this one’s definitely my favourite record released this year. Mr Tillman has one of the clearest voices in the business, combined with a rapier-wit and brash turn-of-phrase. The 650’s have a pronounced ‘relaxed’ voicing, and the top-end can taper-off when underpowered especially. I couldn’t fault this listening session at all, just brilliant.

    So who’s it for?
    If you have 600 dollarydoos to spend on a DAC/amp, you’re pretty much looking at this or the Chord Mojo. The Mojo pips it for wired connectivity (USB, optical + coax), but loses-out on aptX Bluetooth. On the other-hand, it can have a ‘Poly’ grafted onto it which does do SD-card playback; DLNA; MLP; Bluetooth (albeit it non aptX/AAC), but at a significant premium.

    So then, is it worth twice the price of entry over iFi’s Nano Black Label? If you seriously plan on using it for its Bluetooth capabilities, then it’s a genuinely exciting proposition for transparent, powerful and tether-less performance with IEMs and hard-to-drive full-size cans alike.
    Screen Shot 2018-07-24 at 7.03.34 pm.png
    iFi have managed to squeeze just about every plausible feature under the sun into this shiny little gadget - it was certainly an ambitious undertaking and to their credit they’ve executed it brilliantly. It’s a genuine Jack-of-all-trades, and at the end of the day will have you enjoying your music in more circumstances, in more places than any other device I can think of. Which is a ‘win’ in my books. Cheers!


    1. Screen Shot 2018-07-24 at 7.01.51 pm.png
    1. Grimbles
      Grimbles, Jul 28, 2018
      Mightygrey likes this.
  10. faceestrella
    Excellent Delivery - ifi xDSD DAC Amp Review
    Written by faceestrella
    Published Jul 19, 2018
    Pros - Form factor, Great smooth sound, Attractive build, Bluetooth connectivity
    Cons - Fingerprint and scratch magnet, No included mobile USB cable, Male USB-A interface, No USB Type-C
    Introduction: During my visit to Japan a few months ago, I went to the Fujiya Avic Spring Headphone Festival and heading into the ifi suite I was greeted by their welcoming reps and got to take a look at all their goodies, however the xDSD with its svelte and modern look caught my attention almost immediately; So when ifi reached out me and offered me a chance to review the xDSD I leapt at that chance.

    The xDSD is the first foray of a new era of ifi products it seems, embracing a modern look and feel with the X series, seemingly with the xDSD leading the charge being dubbed “Generation X”, after a slew of popular and fantastic products like the iDSD BL Micro and Nano among the popular ones that have entered the market. Does ifi successfully make their transition? Or have they bitten off more than they can chew with some radical changes? Read the full review below to find out,
    Specifications: USB Input: up to PCM768kHz & DSD512 (24.6/22.6MHz)

    S/PDIF Coaxial and Optical Input: up to 192kHz/24Bit

    Dynamic Range: > 113dB (A)

    Volume Control: -101dB…0dB in 1dB steps

    Output power:

    > 2.82V/500 mW @ 16 Ohm

    > 3.7V/270mW @ 50 Ohm

    > 3.8V/48 mW @ 300 Ohm

    > 3.8V/24 mW @ 600 Ohm

    Line out Level: > 2.1V @ 0dBFS (& 0dB Volume)

    THD &N (1V/16R): < 0.005%

    Output Impedance: < 1 Ohm

    Battery: 3.8V/2200mAh

    Dimensions: 95 (l) x66.5 (w) x19 (h) mm

    Weight: 127g (0.28 Ibs)

    Warranty period: 12 months

    Packaging and Accessories: The xDSD comes in about bog standard packaging with an attractive thick white box containing the name, composite image, and the specifications of the xDSD. Opening the box reveals a velour type string pouch for storing the xDSD, the unit itself, some pamphlets and instructions, and a box that contains all the cable connectors and accessories. What is noticeably missing is a connection interface for mobile devices, at the premium price point one might argue that there should be more accessories but in the end it has everything you need to plug the product in and almost everyone should have a micro USB cable handy.

    Build and Interface: The outer shell of the xDSD is composed of two main parts the main part being magnesium alloy and matte plastic for the rear. The faceplate has the 3.5mm ifi proprietary jack that functions as both balanced and single ended outputs, a multifunction button that works as the volume know and volume level indicator and a extra button that controls the 3D+ and XBass+ features. There are also 4 indicator LEDs that detail the type of input, type of file and bitrate being played as well as lights for if either 3D+ and XBass+ are activiated. The rear is where all the inputs are located, with the male data USB port, 5v micro B power only USB port though hopefully type-c is embraced by ifi soon, an optical in and a switch that turns filtering from Measure to Listen. The rest of the physical build is 4 rubber and a Hi-Res sticker. The build quality is very good, the seams where the shell comes together has no gaps, the finishing and paint of the lettering is smooth, and while light, it feels very solid and sturdy. The only thing I can note is that the volume knob/multifunction button sometimes feels like its scratching the metal shell. Speaking of the metal shell, the xDSD has a unique scalloped design and it is polished to a near mirror like finish, this is very attractive in my opinion however this renders the xDSD both extremely fingerprint and smudge prone and quite scratch and ding prone. Because the reflective nature of the shell reveals imperfections readily.

    Usability: For desktop use the xDSD was plug and play for me and did not require any sort of driver installation to properly interface with my Windows 10 machine. Set up was mostly simple, connecting the data cable to my computer and turning the unit on and plug and listen. However, it is important to note that the instruction manual for the xDSD is very important to correctly understand how it functions and how to change settings and the like. This is because while it has a simple 1 button interface this leads to it being unintuitive when trying to troubleshoot what is happening, like turning on or resetting line out mode, changing from Bluetooth to USB or optical and the like, as this takes a certain specific combination of holds and button presses to swap around from the different settings. ifi recommends to maximize the in computer volume and use the xDSD as the control, and it has an indicator that changes the main LED color to correspond to a volume level.

    For Bluetooth the setup is generally pain free, most if not all devices I tried were able to detect and connect with the xDSD properly with minimal fuss. However, with some devices I did experience drops in the connection once or twice, that never seemed to be recurring, so they were probably one of events. Nonetheless for the most part the xDSD is a straightforward device to use daily and with a solid average of 7 to 9 hours of juice from it, it should serve you well. One thing to note however is that if you plan to use it wired with a phone, like a mentioned before you need to acquire an OTG cable for yourself. Volume changing in this mode is courtesy of the source device and not on the xDSD.
    Sound: Sound impressions were taken with a variety of devices. And always a reminder that a while DACs and Amps can affect the sound of what you’re listening to, to a degree it won’t radically change the sound signature and qualities of your audio gear and can merely enhance or complement your gear.

    The overall tonality of the xDSD is mostly smooth and flat, with maybe a bump in the bass region adding a certain warmth but not overtly so, this leads to a certain note thickness, especially on the listen filter, swapping over to measure evens it out more if that is something you would like to try. It seems to be very consistent device to device, this is probably partly due to the OI being below 1 ohm, and it has enough power to drive my HE400i at around 85% volume, though can struggle with super power-hungry cans, (though I think ifi may have something for those 600ohm can owners soon.) The analogue circuits that can enhance the listening experience, namely XBass+ provide a nice pleasant bass bump that is not overbearing nor does it sound artificial, perfect for those with more neutral gear that would like to increase the dose of fun and bass response when listening to music. 3D+ on the other hand is supposed to increase the spatial 3D imaging of the music and the effects of these in my experience were hit or miss, some gear and music combinations responded to it well while others it seemed unnatural or I wouldn't really be able to tell any changes. On the technicality side the staging is accurate, though there seems to not be a pronounced depth, just average, and for width we have a little bit wider than normal, and details are good, while not uber transparent, is not lagging in terms of clarity. Definitely pleasant as an overall daily device in sound, not dry and has an ample level of engagement.


    Conclusion: ifi has stepped into their modern age confidently with the xDSD. Offering a futuristic design, good features, and specs in a relatively compact size and light weight chassis, that while it has blemishes(literally) in the design that might not make it for everyone, you can’t say it’s boring or generic. It provides great sound and a feature set that can rival the competition out there with Bluetooth and extensive file type support. It has good ease of use especially if firmware updates continue to improve stability, and while there is a learning curve to using all the features, keeping a copy of the manual close by, whether physical or digital, will help ease you in and most of what you’re going to do is simple enough to remember. It makes for a capable mini desk DAP that can easily double as a portable option especially in Bluetooth mode. If there was anything I could ask for only better mobile wired support and USB type-C, maybe for the next revision. But overall at $399 it’s a capable device that is highly recommended for those looking for a versatile and adaptable DAC/Amp that is at worst capable and even excellent at multiple use cases.

      Bansaku and blackyangell like this.


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