HIDIZS XO

Introduction​

Disclaimer: the Hidizs XO was sent to me by Hidizs free of charge after being selected for the “Hidizs Product Feedback Insights Program”. This review represents my personal opinion on the set and it is by no means a promotional or paid content.
At the time of the review, the Hidizs XO was on sale for around 59$ at Hidizs’s official webshop.
I wanna thank Hidizs for this opportunity as I get the chance to try one of their products and give my honest feedback that will hopefully be helpful for the brand and the community.

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Technical Specifications​

• Size → 55mm * 24.5mm * 9.35mm
• DAC Chip → ESS SABRE ES9219C x 2
• Compatibility → MQA up to 16X (requires software support, recommended to use HiBy Music, DSD (Native DSD64/128/256), PCM (up to 384kHz/32bit)
• Output type → single ended 3.5mm jack, balanced 2.5mm jack
• Frequency Response → PO(3.5): 20Hz-40kHz (±0.12dB) / BAL(2.5): 20Hz-40kHz (±0.12dB)
• THD + N → PO(3.5): 0.0015% / BAL(2.5): 0.0005%
• SNR → PO(3.5): 118dB / BAL(2.5): 119dB
• Crosstalk → PO(3.5): 76 dB / BAL(2.5): 118 dB
• Output Power → 78mW + 78mW@32Ω 3.5mm SE, 195mW+195mW@32Ω Balanced 2.5mm
• Supported systems → Android, Windows, Mac OS, iPad OS, iOS (if you have older iPhones, though, you’ll have to buy a Type-C to Lightning adapter separately)
• Net weight → 11g

Packaging​

• The Hidizs XO dongle
• A Type-C to Type-C cable
• A Type-C to USB-A adapter
• User manual and warranty card
• Two small “Hi-Res Audio” stickers

Design and Build Quality​

• The X button: used for changing the RGB LEDs’ colors/effects;
• The O/rounded button: used for applying a sound filter (even though the difference is almost unnoticeable) which is recognizable by the color of the outer RGB LED ring.

Performance​

Pressing the physical rounded button should slightly change the sound since there are two filter presets, but I found the two settings basically indistinguishable. Let’s say that Hidizs has put much more attention on the lighting, on the build quality and the overall appearance rather than on the sound filter.
Unfortunately, there also isn’t any button nor any combination of buttons that can be used to select a different gain setting, which is a missed opportunity.

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Some comparisons:​

A very personal take on this dongle and its target market​

• Audiophiles/audio gear hobbyists with the balanced + unbalanced outputs and nice technical specs
• Those who are attracted by RGB lightings (i.e. gamers and similar users)

Final Thoughts​

• The size is very small and thin. I like it because it can be tucked into the case box of my Tanchjim Oxygen, finally replacing the Apple dongle. Very practical, one small box contains both IEM and DAC, ready to slip into my pocket.
• It's a pity that the balanced port uses a 2.5mm size, which is now rarely used in other DACs. I don't have a cable with a 2.5mm jack.
• Perhaps this is the only DAC with a button to change sound filters. There are 2 filter options marked with blue and red lights. It's just a shame that I didn't notice any difference in sound when pressing the filters; perhaps my hearing is limited. If there really is a change, this would be a big plus point for the XO.
• RGB Panel : it only for visual purposes and matching with my keyboard hahaha, it would have been more interesting if the color were to be reflecting to the sound wave of the music being played, but it's not.

• The XO is quite stable during usage, rarely experiencing disconnections with the smartphone.
• The XO doesn't have a volume button. When using the Hiby player app, the volume steps are limited to 30, making it difficult to adjust the volume precisely. However, using the UAPP app allows for volume step adjustment up to 100 steps.
• Battery Consumption: The XO provides a runtime of approximately 10 hours, which is quite sufficient for my needs.
• With the 3.5mm port, the XO can still drive the Oxygen and Nightingale effectively.
• This is my first DAC that supports MQA. I tried MQA on Tidal using the UAPP, and the indicator light on the XO turned purple, indicating successful MQA playback. This was a new experience for me. However, I haven't found a way to play MQA on my PC yet. The indicator light remains green when playing Tidal MQA songs on my PC. If any readers know how to play MQA on a PC, please comment below.

1. Timur - The Bakuucakar
2. Never Enough - Loren Allred
3. A Case of You - Diana Krall

The Hidizs XO is the small DAC with tremendous capacity. It's highly reliable in terms of both sound and power. I highly recommend it, especially since currently on sale for $60.
Thank you to everyone who has read my writing.

Hidizs XO 3 ★★★​

- And for some reason it doesn't work with my Huawei phone. ISH.


It is not a bad performer…. But how well does it fair up against my daily dongle?

SOURCE & GEARS​

PLAYLIST (AS TESTED)​

Full Review – Hidizs XO – Incandescent Illuminance ​

Disclaimer

• The review equipment is a demo unit sent by Hidizs as a part of a tour review, Hence, massive appreciation to Hidizs and Ms/Mrs. Bella Juan, a representative taking care of this tour for providing this demo unit and making this review possible.
• Regardless, all opinions remains original ideas, thus there is zero influence from any 3rd party or external opinions.
• No EQ or 3rd party filter presets were used during the entire review.
• Sound evaluation are kept neutral from any 3rd party accessories (ie; eartips, 3rd party cable, reversible/unreversible mods)
• Burn-in was done for 50+ hours prior to review.

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Introduction
“How could we make our product stands out the most unique than the rest of our competitors?”

That is the kind of question that begs companies to think out of the box, bolder in marketing their design and providing infinite possible functionality, in order to offer clients and customers a unqiue, one-of-a-kind product that stands out from the rest of the majority. Audio equipments such as DACs and amplifiers mainly regardless of form size, has always been touted with minimalistic, professional designs with little eye-catching details which to some people might have felt a tad “visionless” and “boring”.

What I have today with me is a brand new XO dongle DAC/AMP from Hidizs. Hidizs is a Chinese company typically known for their small DAPs and for the past couple of years they have been venturing into this dongle market with previous releases such as the S9, S9 Pro, DH80S and plenty more. It has been a while since I tried any Hidizs product apart from the AP80 DAP which I owned long time ago and this is my very first time being offered an oppurtunity by Hidizs to review their product.

The XO features a dual ESS Sabre ES9219C which can be found in their AP80X audio player, protected by under a high-density aluminium alloy chassis. What makes this dongle standout from the rest of its competition is the RGB LEDs along the body of this dongle. As we all know, some majority of audiophiles are also gamers in disguise, perhaps this is a coincidence or Hidizs has been aware of this case since there are the evergreen “X” and “O” symbols of gaming consoles on the main interface. To make things short, the “X” button allows user to cycle through up to 15 lighting effects, while the “O” button is to switch through two digital filters which will be enlighten further into the review.

In other cultural understanding the term XO is also recognized as hugs and kisses. Which can be defined as a lighthearted way of expressing affection, sincerity or deep friendship. The X represents a kiss, while the O represents a hug. Before the scene could get a whole lot spicier, let us get straight into the review and determine whether the Hidizs XO deserves our love.

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Packaging and Accessories
The Hidizs XO came in an adorable, palm-sized packaging that slides outward unveiling a similarly sized hard plastic box. The cardboard sleeve itself is printed with an illustration of the dongle itself including its marketing logos at the front while at the back and sides are printed with all of the specifications and extra informations regarding the product itself.

Upon opening the box, its pretty straightforward without much frills you will be directly greeted with the dongle itself resting in a foam tray which can be pulled easily via a ribbon. Other than that, under the foam tray you will notice a small cardboard box where you can find the included generic USB-C with a Hidizs branding on one side to connect to your Android phone, laptop, etc and couple paperworks as well as a product manual. Unfortunately, for our dearly Apple friends Hidizs does not include any Lightning cable or an OTG with the XO. However, Hidizs do sell the LT02 which is a USB-C to Lightning cable on their website for an extra $21.99.


Design and Ergonomics
Built entirely out of high-density aluminium alloy which has undergone through 5-axis CNC process, the XO boasts a modern and elegant design which blends quite easily with the rest of most equipment. Tiny “H” etchings of Hidizs initials on the sides which works as a grill, allows the RGB LED lights shine through the chassis. Hidizs were generous enough to have the XO available in three colour options, Black, Rose Gold and Silver.

Weighing at just 11g and measuring at 55 × 24.5 × 9.35mm, this dongle feels robust yet light and small in profile that is no less than the length of a pinky finger. The edges are angled and smoothen out for better ergonomics and safety.

Top-end of the dongle has a 3.5mm single-ended and a 2.5mm balanced connections, while on the bottom there is a USB-C port which is the norm for all latest dongles in the market. Perhaps, it would have been much positive if the XO is equipped with a 4.4mm Pentaconn as most audiophiles tend to prefer it to the much fragile 2.5mm.

Looking at the main user interface, there are two clicky buttons each distinctly designed as “X” and an illuminating “O” that glows in green colour when powered. Each button allows users to cycle through different features that came in this adorable rectangular box.


Features
Speaking of features, what separates the XO from any other dongle in the market is the existence of RGB lightings on each side, programmable up to 15 effects via the “X” button. Of course, it will draw out slightly more power from the host device and generates more heat, but it can also be switched off when not needed. The light show is unfortunately unskippable, unless by unplugging it or patiently cycle through all the options. Some may see this gamery gimmick as a con, but as long as it is not affect it’s sonic performance and user-friendliness negatively in any possible way.

Furthermore, the illuminated “O” button is also apparently an indicator for file formats and sampling rate such as below;

Color	Format
Red	PCM 352.8/384kHz
Pink	MQA
Blue	PCM 176.4/192kHz
Green	PCM 44.1/48/88.2/96kHz
Yellow	DSD 64/128/256

Clicking the "O" button allows the user to cycle through the filter presets. There are two types of filter which are colour coded on the light ring as Blue in its stock and Red, both filters seemed to mask the treble to some extend. Despite that, the differences between the two filters are almost inaudible and hard to tell unless one is in a quiet ambience. While the differences are not night and day, the Red digital filter seemed to reduces treble a tad more compared to the Blue filter does when critically listened.

Blue LED: High frequencies reduced by 20-30%, thus low intermediate frequencies will be much prominent
Red LED: High frequencies reduced by 30-40%, thus low intermediate frequencies will be much prominent

I did grab my chance ask Hidizs's representative regarding whether the digital filters can be turned off, since I noticed there was a Green coded light while rotating through the filters. As far as I was informed, there is no option to turn off the digital filter settings, the green coded effect was merely a default setting whereby it will change colour indicating the sampling rate of the current song playing as per shown in the table above.


Specifications

• Dimensions: (L×W×H) 55*24.5*9.35mm
• Net weight: 11g
• DAC SoC: 2* ESS SABRE ES9219C
• Crystal oscillator: External independent crystal oscillator
• THD+N: PO (3.5mm): 0.0015%/BAL (2.5mm):0.0005%
• SNR: PO (3.5mm): 118dB/BAL (2.5mm): 119dB
• Crosstalk: PO (3.5mm): 76dB/BAL (2.5mm): 118dB
• PCM: Support up to 32bit/384kHz
• DSD: Native DSD64/128/256
• MQA:16X
• Input option: 1* Type-C
• Output option: Single-ended (SE) 3.5mm, Balanced 2.5mm
• Output power: 78mW+78mW@32Ohm, 3.5mm (SE), 195mW+195mW@32Ohm 2.5mm (BAL)
• Supported systems: Android, Windows, Mac OS, iPad OS, iOS (Lightning cable + OTG sold separately)
• Tested at: $86.00 USD

Performance that outclasses its size and price tag, the XO is equipped with dual ESS Sabre ES9219C DAC which can be found in Hidizs AP80X, as well as products from other brands such as Shanling UP5 and M3X. Boasting a whopping 78mW+78mW @32Ohms (SE) and 195mW+195mW @32Ohms (BAL) allowing this device to power almost any pair of IEMs and headphones. On lesser efficient headgear and planar-magnetic might be a tad too demanding for the XO could sufficiently provide.

This small dongle is also equipped with a high-precision independent crystal oscillator is adopted to ensure superior phase noise level whilst improving data connection. Even when plugged with a highly sensitive IEMs, the XO proven to be silent at all times without any hissing or humming background noise.

Despite the praises, the XO draws quite a lot of power from its host device, thus making it a less effective when used with a phone, unless it has a large battery. Added with the lights are turned on, the XO will definitely drain battery life a lot faster with greater heat generated. Preferably as well, if Hidizs should have also provided a volume button with wide volume steps or a gain setting on the XO. This is due to the decibel (dB) gain per volume increase were just simply way to high to adjust via the built-in host device volume controller. A small, clumsy mistake on the volume might cause the user to blast their music into their ears, especially for those who listens at lower dB with sensitive IEMs/headphones.


Sound Impression
The Hidizs XO is tuned quite differently when compared to other ESS DACs which I owned in the past, its neutral with a hint of warmth and smoothness in other words it does not leave an irritating harsh tail/transient like a poorly ESS Sabre implementation does. Think of it like listening to an EQ-ed Etymotic SE/SR-series with a 1 dB increase between 60-500Hz. Of course, that being said DAC chips should not produce any sound to some extend, the implementation what matters the most as variables from other components like an op-amp and etc must be taken into account.

Regardless, the XO synergize well with pretty much anything but may not for a brighter gear unless listening music using a stethoscope is actually possible. Soundstaging (ie; width, height and depth) is expansive and airy although it would not quite considered holographic as it almost seems trying to mimick instead. Detail retrieval is also a strong asset for the XO as it being a delta-sigma DAC, subtle nuances and microdetails are presented precisely even on quieter tracks.

Separation between instruments and vocals are outstanding with a dark background behind which gets even darker with the balanced 2.5m output which is expected due to the numbers in the specs sheet. The XO preserves vocal forwardness in mid-centric IEMs exceptionally well, although note weight is a bit lean. Uru’s voice in Furiko (From THE FIRST TAKE) - Uru which usually is intense and velvety warm seems slightly affected, which became slightly lean yet still retaining the fluidity and smoothness in her vocal. Layering was a bit of a shame, some extend of the elements in Mad About You – Hooverphonics and sub-bass rumbles in First Love – Hikaru Utada are a tad mushed together. Dynamic range was cut short, hence bass decay are slightly faster but for those who prefer tighter, faster mid-upper bass might gain from this dongle.


Testing Gears

• Audio Technica ATH-IM02 (36 Ohms 113dB/mW)

The ATH-IM02 is notoriously well-known of its nature for being a strictly demanding in-ear monitor for source pairing and low output impedance (preferably <1 Ohm) requirement to ensure its dual-BA drivers performing optimally. An impedance mismatch could skew its frequency response from a flat, mid-centric studio reference to a Harman Target with harshly gritty and thin treble in an instance.

The Hidizs XO seems to be a solid, pristine pairing together with the IM02, there was no trace of frequency response shift when plugged into the XO. Despite losing its velvety warm midrange slightly, the XO preserves the IM02 exceptional vocal forwardness and instrument separation impressively. Low-end sounded much chesty, tighter, with faster bass reponse although, the dynamic range and richness is sacrificed by a small amount. Higher frequencies seemingly relishing fair share of vividness, clarity and extension which greatly enhance the airiness which this IEM needed. Definitely my favourite pairing out of all!

• Dressage DS4+2 (24 Ohms 102dB/mW)

With a low impedance and high sensitivity rating synergy makes the DS4+2 perfect to detect any subtle background hiss or EMI interference within an equipment. However, as far as detailed and thorough testing were done, the XO does not produce any possible background noise, cleanly provide a silent and pristine audio playback quality via the DS4+2 even on maxed volume when no music was played.


Comparison(s)

• Letshuoer DT02

The DT02 with a single Cirrus Logic CS43131 DAC in its internal provides a much warmer, richer and natural sound signature, that is much well suited for long hours of laid-back listening compared to the XO. Both dongles has almost similar separation with the XO edges in front by a marginal amount but layering wise speaks different. The DT02 could present much complex layering especially within the low-end region with greater dynamics and note weight.

Other than that, the DT02 is beaten quite easily by the XO in terms of soundstaging and clarity, it sounded a lot more intimate and slightly muted at higher frequencies despite having almost similar capability to draw out subtle nuances and microdetails in vast majority of music. The XO is overall a better dongle by a mile which deservedly so, compared to the DT02 if it were compared via technical specs since the XO was much quieter, free from any hiss. Both dongles does get warm from time to time but the XO reaches temperature a lot quicker and higher with the RGB light show turned on, which indirectly causes faster power drain from the host device compared to the DT02.


Conclusion
To wrap this review up, Hidizs has brought up an unique package into the portable audio segment in this small, adorable dongle. Although, it would not be the next big thing at least in my concern compared to other dongle DACs within the similar or lesser price range. Regardless, the XO is still a worthy selection for those who wanted something that is aesthetically unique and quirky that was executed very well.

The XO is build exceptionally well as a whole, I could not find any complaints regarding the overall build and ergonomic aspect of this device. However, it would have been a stellar if the XO comes with a 4.4mm Pentaconn output to increase its relevance among audiophiles as 2.5mm is awarely gotten much obsolete from time to time. Furthermore, a gain setting button or a volume button should be a mandatory for a dongle of this powerful driving power, cannot say the amount of times I have been bamboozled by the sudden volume increase whenever I listen via the HibyMusic App.

Other than that, the XO also was not the most efficient and low-temperature friendly dongle one can get in the market, especially with the RGB effects turn on, it will drain most smartphones quite similarly to some entry-midrange level DAPs. Although, it is not severely piping hot that it could melt plastics, one could at least heat their fingers during the cold weather in no time with the amount of heat the XO could generate. This thus, makes it suitable for desk use instead of purely portable.

In a nutshell, this small powerhouse deserves more exposure for those who are into a dongle that could provide a pristine, accurate sounding and capable of providing wide gear coverage of driving power. Its sonic performances are also one of the main highlight of the XO which definitely benefitting neutral-heads and those who needed a natural reference-like equipment. Perhaps, it could and should have been a better product if only those subtle details such as a gain switch/button or an external volume button could have been added and a better heat dissipation.


For those who are interested to make a purchase for the Hidizs XO, can refer via this link (non-affiliated):
https://www.hidizs.net/products/hidizs-xo-single-ended-balanced-mqa-dongle

Hidizs XO Review: Party On The Outisde, Business on The Inside​

PROS:​

• Unique 15-mode RGB Feature
• Digital Filters
• Sleek, lightweight, compact design
• Detachable Type-C input for solid device compatibility
• Intuitive controls
• Noise Free Output
• Decently Powerful SE and BAL
• Uncolored and neutral sound
• MQA (16x), DSD256 and Hi-Res (32bit, 384khz) support

​

CONS:​

• Gets hot pretty fast
• Battery drain can be a little bit much
• RGB is more of a party trick than something practical
• Digital Filters only have a minimal effect
• No physical volume rockers
• No LO
• 2.5mm (nitpick, I just prefer 4.4mm)
• Might come across as too clean/clinical

WHO THIS IS FOR:​

• People looking for a compact DAC with 2.5mm BAL output
• People who like quirky features on their DAC
• People who are looking for a powerful but portable source
• People looking for a clean, versatile DAC

WHO THIS ISN’T FOR:​

• People looking for the most powerful DAC for the price
• People who want an unadulterated, no frills source
• People who want dedicated physical volume rockers
• People who want a vibrant, energetic sounding DAC

SHORT REVIEW:​

"The Hidizs XO is a small yet powerful DAC with quirky 15-mode RGB lighting that sets it apart from other DACs with its unique presentation. While it may not be the best in one specific thing, it makes up for being a solid, all-rounded solution for portable audio enthusiasts." RECOMMENDED

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FULL REVIEW:​

• 78mw x2 @ 32ohms 3.5
• 195mWx2 @ 32ohms 2.5

• Independent Crystal Oscillators
• Single 5-axis Aluminum CNC
• Sample rate based on the color
• Hiby Music App support
• Hi Res and MQA certified

• 3.5mm: 76dB
• 2.5mm: 128dB

UNBOXING:​

BUILD QUALITY, INPUT AND CONTROLS:​

DEVICE SUPPORT SUPPORT:​

FEATURES:​

POWER AND BATTERY:​

SOUND:​

VERDICT:​

• Head-fi: https://www.head-fi.org/members/kesobie.554565/
• YouTube: https://www.youtube.com/channel/UCRv42fx1TIcEpP_QBbkhEOA
• Facebook: https://www.facebook.com/OB.ODIO
• Twitter: https://twitter.com/obodioreviews
• Instagram: https://www.instagram.com/obodioreviews/

• Type C to type C cable
• Type c to USB adapter
• 2 Hi-Res stickers
• Manual and warranty card

• 3.5mm SE - 78mW + 78mW at 32 Ohms
• 2.5mm Balanced - 195mW + 195mW at 32 Ohms

Disclaimers​

Introduction​

Features and Functionality​

• Circular button for Digital Sound filters which has an indicators or blue and red, Blue color has more pronounce mid frequency while the red one emphasizes more on low frequency-
• A (x) switch for the RGB Function which lets you choose between different colors to light up the Dac/Amp.

• The HIDIZS X0 supports PCM decoding up to 32-bit/384kHz, as well as DSD256 Decoding. This means that it can deliver high-resolution audio for an immersive listening experience.
• The X0 is compatible with various devices, such as smartphones, laptops, and tablets that support USB OTG.
• This has dual ESS SABRE ES9219C*2 dac chip which gives superior audio quality that enhances the listening experience.
• Dual port which conists of one 3.5mm single ended and 2.5mm balance ended

• Green: PCM 44.1-96KHz
• Blue: PCM 192KHz
• Red: PCM 384KHz
• Yellow: DSD64-DSD256
• Orange: MQA unfolding which supports upto 16x

Drive Type: Power​

Sound Signature​

Bass​

Mids​

Treble​

Technical​

Conclusion​

Test Tracks​

• WINNER- Abyssmare
• Tomoshibi- Nonoc
• Undercover- Lyrical Lilly Cover
• Maihime- Lyrical Lilly
• Look at me- Happy Around
• Axel F- Harold Faltermeyer
• Sleep Now in the Fire- Rage Against the Machine
• Kimagure Mercy- Cover by Ouro Kronii
• Kuusou Mesorogiwi ❮alty Remix❯- JubyPhonic
• Axel F- Crazy Frog Version
• DJ NANMO WAKARAN- Unichord
• Round and Round- Merm4id
• Umbilical- Milgram Project
• Beautiful Sentence- V.A. TRINITY SEVEN FULL ALBUM ｢MAGUS MUSIC LIBRARY｣
• Anicca- Hitomi Harada

Review Setup​

• AET07 eartips
• 3.5mm standard cable
• TempoTec E44
• OPPO A95
• Samsung S10+
• Roon Music Player
• Local Music Files and CD ripped files
• Volume level: 50-60%
• Hakugei Starry Night

DISCLAIMER:​

• I have no affiliation with Hidizs and have not received any monetary compensation during or after writing this review. Zoie Hello provided this unit to me in exchange for an honest and unbiased review.
• As a non-professional reviewer, I aim to use simple terms that can be understood by both beginners and experts in the hobby.
• Please keep in mind that the opinions expressed in this review are subjective and based on my personal experience with the unit. I encourage you to try the product yourself to form your own opinion.

PACKAGING​

BUILD QUALITY​

FUNCTIONALITY​

• Green: PCM 44.1-96KHz
• Blue: PCM 192KHz
• Red: PCM 384KHz
• Yellow: DSD64-DSD256
• Orange: MQA unfolding

• The red filter adjusts the frequency response by reducing high frequencies by 30-40% while boosting the lower intermediate frequencies. This results in a more well-rounded frequency response overall.
• The blue filter, on the other hand, decreases high frequencies by 20-30% while allowing the lower intermediate frequencies to stand out more. This leads to a more emphasized midrange.

SOUND QUALITY​

CONCLUSION​

• Provides an almost neutral sound
• DSD Support up to DSD256
• MQA Support
• Decent power output
• It has a 3.5mm unbalanced and 2.5mm balanced ports
• Very portable and lightweight
• Support to Type-C and Type-A all covered by its default inclusions

• No playback buttons
• The colorful RGB aesthetics may not be everyone's cup of tea

Review Of The Hidizs XO​

Introduction​

Hidizs, a business that excels in creating what we now refer to as digital audio players, has a sizable following among audiophiles. Since its founding in 2009, the firm has extensively studied and produced a huge number of digital audio players, other portable sources, such as dongle dac/amps, and other accessories needed to use with these devices. Hidizs previously issued some IEM as well, establishing their introduction into the IEM industry, however I haven't heard more about any of their IEM since. They have truly taken their company seriously and have developed such a following among audiophiles. They have several releases that serve every market categorised by pricing. And now I'll be examining the Hidizs XO, a portable dac/amp that is mostly marketed to gamers who are audiophiles or to gamers alone because it has several characteristics that gamers in today's market value. Before we learn more about the Hidizs XO, let's clear up a few things.

Disclaimer​

Specification​

The XO contains two ESS SABRE ES9219C that combine to output a balanced 2.5mm and a single ended 3.5mm. Given that it has dual RGB light stripes and a setting for 15 various presentations, this device's capabilities surpass those of similar products in its price range on the market. These had a really excellent light presentation with 15 various light settings, which made me a bigger gaming nerd. With a green light that is constantly on and changes to one of the other four identifying colours when the button is pressed, the button above the type-C socket looks fantastic and lets us know what sample rate we are listening to. Another button in the shape of an X is located below the round button and is used to switch between the various light types. The balanced 2.5mm and single ended 3.5mm sound output ports are located on the side of the type-c socket opposite the USB connector. It has a very intriguing form factor and is neatly packaged. It is complemented by the type C to Type C cable that is included with the dongle; the wires are braided and have a sparkly silver appearance. The XO dongle's aesthetic appeal and one-piece CNC aluminum housing make it a stylish choice. The output formats for the dual dacs and independent crystal oscillators include 32bit/384kHz PCM, DSD256, and MQA 16X. The Hiby Music app also works with the dongle. I've included a table below for more detailed information:




For convenience and better use, I coupled this dongle with my beloved LG G8X, and it worked as intended. I had no problems utilising the pair while commuting or unwinding, and they were both simply pocketed and kept safely. Additional details that are not underlined in the paragraphs are provided below.

​

Sound​

Most of the time, the XO's sound is analytical and clear. Without a doubt, this is the purest sounding dongle dac I have heard in this price range. While the treble gets more exposed thanks to the clarity, the midrange becomes more expressive and crisp. On the other hand, the bass here feels more restrained and textured. Yes, these are that good; I had a similar sensation when I bought the Questlye M15. For some people who are used to listening to warm sources, the treble may sound a touch thin and bright, but they won't sound objectionable; instead, the treble may sound edgy. It sounds pretty well because the mid range has a better hold on the notes. The voices and instruments have a rich, detailed sound that is well exposed in the mix. I like how the XO's sonic presentation essentially takes a neutral stance while sounding everything but monotonous. The response is smooth in my experience; I don't think the music coming out of the XO is brittle or metallic, but it does sound aggressive but not sharp. All I have to say about the tonal performance of this is this; let's move on to the technical performance.

Technical Performance​

The technical prowess of this XO is pretty impressive, easily providing the cleanest and most detailed sound. With enticing details emerging, the resolving power is excellent. The stage being big enough to enable depth field and wide play does help with the sense of direction and excellent imagery. To provide tactile and dynamic range, the Xo prowess leans toward its source. The nicest part of this is that throughout all of my testing with any of my IEMs, I never felt as like that particular IEMs had been deprived of their full potential. The majority of the time, when hearing from other sources, the IEMs hesitated to function as they should and improved over particular portions of the response, but the XO maintains the performance in a perfect balance and improves across the spectrum. I can't dispute the fact that XO brings out the best in every IEM. Let's face off with the IEMs I currently have and pair them with XO.

Sound Impressions​

UM MEXT​

With Unique Melody MEXT, the sound was surprisingly muted around the 6–8k range, where I perceived an offensive approach. I was relieved to experience little to no hotness and sibilance in the treble region, but the mid range was brought forward to preserve the integrity of the vocals and instruments. The bass improved in control, texture, and impact. Although over certain songs in the rock and metal genres, the only area that suffered was in the mid bass with some thin presentation.

Thieaudio Monarch MKII​

The treble was the same as it was with other sources when the Thieaudio Monarch MKII was used, but the midrange was improved with excellent control over the wispiness felt with vocals, especially female vocals. With more control, the bass got punchier and rumbly. Overall, I thought the tone was more upscale, but I still appreciated the feedback I got from other sources like V6 or hipdac. However, there was undoubtedly a technical update.

Thor Mjolnir MKII​

With Thor Mjolnir MKII, there was a change in the response's treble and midrange dominance. I perceived that the excessive treble and reserved lower midrange were balanced, giving the treble the proper impact and bringing out the lower midrange. Although it still seemed somewhat boomy and sounded clean and more textured, the bass became incredibly controlled. The technical performance was essentially same, but the stage's width shrank and the front and rear of the stage picked up more sound.

TangZu Shimin Li​

Tforce Yuan Li​

Using Tforce Yuan Li, Yuan Li has the same tone as Shimin Li but better technicality. It comes off as more endearing and supportive of its relationship with XO because nothing jarred or sounded out of place. The treble became more even, the midrange was clear, and the bass had excellent control.

Sony MH755​

With the Sony MH755, there was nothing particularly novel about the pairing, but there was improved technological response. The resolution improved and imaging clarity was noticeable. I couldn't identify any other big revamps or upgrades over other aspects aside from these. Although I like the MH755 and XO combination.

Tracks Used​

Curtis Mayfield - Pusherman
Earth, Wind & Fire - September
Earth, Wind & Fire - Let's Groove
Boston - More Than A Feeling
Fleetwood Mac - Everywhere(Remastered)
Toto - Africa
The Police - Every Breath You Take
George Benson - Affirmation
Daft Punk - Doin' It Right
Daft Punk - Derezzed
Daft Punk - Tron Legacy (End Titles)
GOJIRA - Amazonia
The Mars Volta - Inertiatic ESP
Fergie - Glamorous
50 Cent - In Da Club
Jay Z - Holy Grail
Erbes - Lies
Nitti Gritti - The Loud
Juelz - Inferno

Conclusion​

• Dunu Kima
• Dunu Talos
• 7Hz Timeless x AE
• 7Hz Salnotes Zero
• Akoustyx R100
• Akoustyx S6
• FloAudio Lily
• Hidizs MD4
• Hidizs MM2

• Two physical switch button namely the X and O
• X is for switching the digital filters, which i will further explain what the filter actually does below
• O is for switching the RGB light effects

• Talos on its own the soundstage is fairly wide, pairing it with XO does enhance the soundstage a little more, but to my ears, it can be too wide where it is sounding a little artificial in terms of the soundstage
• Bass on the Talos is quick and tight, but somehow lacking a little in terms of the quantity and impact, pairing it with XO does seem to gift the Talos a slight lift on the low end, bringing some grin to a certain people who prefers the Talos to have a little more bass quantity
• Highs on the Talos remain more or less similar as Talos’s highs are pretty smooth except if you turn on the hybrid mode (Planar+BA
• Overall, i think the Talos pairs well with the XO

• MD4 is a full BA IEM and the sound signature is rather neutral to my ears, i personally find this pairing to be very enjoyable as XO itself is not tuned in an analytical way
• Bass has got more impact on the MD4 (Balanced mode), slightly more quantity to my ears, remains fast and well controlled
• Soundstage is also slightly wider on the MD4, it has got a bit more 3D-ish presentation to it rather than a flat 2D prior to pairing it with the XO

• MM2 itself is a U shape sounding IEM with swappable filter to fine tune the sound according to your preference
• On a balanced filter, pairing the MM2 with XO, it gives the MM2 slightly more dynamics overall.
• Bass is punchy and tight, highs are non offensive with good detail retrieval for the asking price
• Slightly wider soundstage on the MM2 also

• Slightly more powerful on the S9 Pro
• S9 Pro is fairly neutral sounding, slightly energetic on the top end, bass is accurately reproduced and doesn’t have any boost on the low end
• Soundstage on the S9 Pro is not as wide compared to XO
• Overall i would say both are tuned differently and catered to different audience
• S9 Pro is for those who prefer a more neutral listening experience whereas XO is a little more on the musical side (slightly warm, fun bass and wide soundstage)

Preambles:​

• I use the term “source” to denote a DAC + Amp combo.
• Sources do not make sounds. Therefore, when I say sources “sound” a certain way, I talk about the change they make to my IEMs and earphones.
• I want my music to be crisp, clear, well-separated and form a 3D soundstage around my head. Sources that intensify those characteristics of my IEMs are considered “better”.
• This review is based on my subjective experience. Ratings are given based on A/B tests with benchmark sources and IEMs.
• Making loud noises does not mean that a pair of IEMs or earphones are driven to their full potential.
• Despite my textual descriptions, improvements from sources are minor and nuanced. If you are beginning your head-fi journey, getting different IEMs or earphones would yield more benefits. If you know your gears very well, improvements from sources can be delightful.
• The XO used for this review was a preproduction sample provided by Hidizs (Thank you!). The unit is retailed for $99 and can be found on Hidizs official store (non-affiliated link)

Specs:​

• DAC Chips: ES9219C x 2
• Output ports: 3.5mm (Single-ended) and 2.5mm (balanced)
• Single-ended output power: 78mW@32ohm per channel
• Balanced output power: 195mW@32ohm per channel
• Recommended impedance: 8 - 250ohms
• MQA support: 16x

Handling and Usability:​

• The blue filter makes the treble a bit sharper. For instance, the E string of violins would sound sharper and more “bitey”. This effect can translate to a slightly clearer sound signature.
• The red filter rolls off the treble a bit, making high notes rounder and less bitey. This sound reminds me of the slightly rounded treble presentation I adore with S9 Pro.

Sound Performance​

• Moondrop Blessing 2 (22ohm, 117dB/Vrms)
• Campfire Audio Andromeda 2020 (12.8ohm, 112.8dB/mW)
• Final Audio E5000 (14ohm, 93dB/mW)
• Apple USB-C to 3.5mm dongle
• Hidizs S9 Pro
• Topping G5

Average IEM and earphones (4/5)​

Low-impedance, high-Sensitivity IEM (4/5)​

Low-impedance, low-sensitivity IEM (3.5/5)​

Conclusion​

• DAC: ESS SABRE DUAL ES9219C.
• Independent Oscillator Crystal.
• MQA x16: requires use of software to cooperate, such as HiBy Music.
• DSD: Native DSD64/128/256.
• PCM: Support up to 384kHz/32Bit.
• Sample rate indicator light: 5 colours.
• RGB LED Illumination: Support up to 15 different modes.
• Build quality: CNC machined aluminium alloy.
• USB interface: Type-C.
• Audio Outputs: Single-Ended 3.5mm, Balanced 2.5mm.
• Frequency response: PO(3.5): 20Hz-40kHz(±0.12dB) / BAL(2.5): 20Hz-40kHz(±0.12dB).
• THD+N: PO(3.5): 0.0015% / BAL(2.5): 0.0005%.
• SNR: PO(3.5): 118dB / BAL(2.5): 119dB.
• Crosstalk: PO(3.5): 76dB / BAL(2.5): 118dB.
• Output power: 3.5mm SE: 78mW @32Ω. 2.5mm BAL: 195mW @32Ω.
• Supported systems: Android, Windows, Mac OS, iPad OS, iOS (Lightning to Type-C adapter must be purchased separately).
• Dimensions: 55x24.5x9.35mm.
• Weight: 11g.

• Hidizs XO dongle.
• A short USB Type-C to Type-C cable.
• One USB Type-C female to Type-A male adapter.
• One warranty certificate.
• One serial number card.
• One Hidizs VIP card.

• Red: PCM 352.8/384kHz.
• Pink: MQA
• Yellow: PCM 176.4/192kHz.
• Green: PCM 44.1/48/88.2/96kHz.
• Blue: DSD64/128/256.

• Hidizs AP80 PRO-X
• Hidizs AP80 PRO-X Red Copper LE
• Xiaomi Redmi Note 8 Pro
• Letshuoer D13
• Letshuoer S12 Pro
• TRI KAI x HBB
• TinHiFi P1 MAX Giant Panda
• TinHiFi T2 DLC
• Kinera Celest Gumiho
• Rose QT9 MK2s
• Hidizs MD4
• Dunu Titan S
• Dunu Falcon Pro
• ISN H40
• Yanyin Aladdin
• Penon Globe

• Construction and Design: 92
• Packaging and Accessories: 75
• Connectivity: 85
• Operability: 80
• Sound: 90
• Quality/Price: 91

You can read the full review in Spanish here