You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
HIBY XENO
- Added by Zerstorer_GOhren
- Create date
kesobie
100+ Head-Fier
Pros: One of the most EQ capable IEMs
Superb transient response
Versatile controls
Good volume levels
Dedicated EQ app
Lightweight build
Spec and feature rich
Superb transient response
Versatile controls
Good volume levels
Dedicated EQ app
Lightweight build
Spec and feature rich
Cons: Complex EQ app
Not the most refined tuning
Cheap build quality
Not the best fit and seal (subjective)
Not the most refined tuning
Cheap build quality
Not the best fit and seal (subjective)
HiBy Digital Xeno Review: IS THIS THE FUTURE OF AUDIO?
WATCH FULL REVIEW HERE:
PROS:
- One of the most EQ capable IEMs
- Superb transient response
- Versatile controls
- Good volume levels
- Dedicated EQ app
- Lightweight build
- Spec and feature rich
CONS:
- Complex EQ app
- Not the most refined tuning
- Cheap build quality
- Not the best fit and seal (subjective)
WHO THIS SET IS FOR:
- People who like new tech
- EQ lovers
- People who like an earphone with versatile controls
- People who like lightweight earphones
WHO THIS SET ISN’T FOR:
- People who want a refined product
- People who want detachable cable
- People who want a simple product
- People who want a sturdy build
RECOMMENDED GENRES:
- Pop
SHORT REVIEW:
The Xeno is a good look at what the future might bare for audio. A primarily digital device with built-in EQ, versatile inline controls, powerful DAC/AMP and a streamlined process that allows for a truly personal listening experience. Unfortunately, it suffers from the downfalls of a first gen product with a lot of rough edges from tuning to the built. Additionally, the EQ is completely contradictory to HiBy Digital’s target demographic of the casual listener. Nonetheless, HiBy Digital can comfortably say they’re one of the pioneers of the future of audio. RECOMMENDED WITH CAVEATS.If you were to ask me how wireless audio tech could be improved, I can tell you a million things I want changed and improved. But if you were to ask me how wired audio could be improved, it’s a little harder to think of something that doesn’t require literal magic to do.
This is why when I found out about the xMems technology, I was quite baffled that audio tech could be improved this way. Obviously, there’s too much complicated tech to explain on what xMems is and what it does, so let me share you my experience with the HiBy Digital Xeno!
NOTE:
The HiBy Xeno has a Kickstarter for those who want to support the development of the product and also get to experience what the future of portable audio may be. Stay tuned for the link!
Big thanks to HiBy for sending over the Xeno in exchange for my honest thoughts.
THE XENO FILES
Let’s tackle what makes the Xeno such a special set in the first place. There are 2 modern audio tech jammed into the Xeno’s self; xMems and DSP.
DSP has been with us for a very long time, but only surfaced in portable audio recently due to the loss of the headphone jack. Another complicated tech that I like to simply see as “built-in EQ and DAC”. It’s more than that, of course. But most people wouldn’t really care what it is more than what it does for them. We’ll talk more about this very soon as it plays a very important part to the identity of the Xeno.
Next, we have the xMems. This tech has been out for quite a while, but my personal experience with xMems prior was on in-line microphones. I never understood why some cables had better microphones than others until I discovered some of them were using xMems tech. Now, xMems have evolved to be used for speakers which can apparently improve the sound quality due to its higher efficiency, all-silicone construction and small size. Quite frankly, I don’t know much about xMems to tell you how much technological advancement this is. But any advancement is great as long as it actually improves on the existing tech. But does it?
BUILD & FIT
If there’s one thing I know I don’t like about the Xeno, it’s the build and fit. Granted, the Xeno is from HiBy’s lifestyle brand, HiBy Digital. They don’t specialize in “audiophile” or “enthusiast” needs, moreso casual and general purpose. This means that the Xeno is catered to the casual people who happen to also like new tech.However, this is not for those who are people like me who put fit and build pretty high up in priority. First and foremost, the fit itself is horrendous. It barely seals in my ear and the shape really does not help with this. I understand this is a self issue, but I also know that a lot of people will probably find the shape of the Xeno to be pretty bad.
While I don’t really think the all-plastic design is bad as it does make the Xeno rather lightweight and easy on the ears, the cable isn’t really the best cable in the world. Granted, it was explained to me as well as other wired xMems IEMs that the cable used is specifically used for the drivers. This means it can’t be detachable (yet) and the quality is fixed to how it is.
But how is the quality? Not very good, I’m afraid. Very tangle prone and pretty cheap feeling. The material is a sort of cloth-like with a soft and supple feel that is a little makes my face itch whenever it rubs on it.
I will give HiBy some props for the rather innovative center console of the Xeno. I have not seen an IEM with this big of a middle console that acts like a more advanced version of those that come with cables with microphones.
This allows to you to change the volume, pause, play and skip tracks and act as a microphone as well. But most importantly, this allows you to change the tuning on the dot. You can do this by pressing the circle button and you’ll see the LED at the center change color. This plays a VERY big part on the next section which will be the EQ and DSP part.
But before we talk about that, I should also mention that the center console features the DAC as opposed to be on the type C end. This features a CS43131 and ES9018C2M.
FEATURES
If there’s one thing I can appreciate HiBy Digital doing for Xeno, it’d be how jam packed this thing is.I should first reiterate that the Xeno isn’t necessarily an “audiophile” product. Despite this, the audiophile features of this thing are honestly pretty insane.
First, we have the usual stuff you find in earphones. Inline microphone with controls (that is more versatile than your usual in-line controls), type C connection and DSP connection.
Where the Xeno diverts from the crowd is what it does with all that tech. First, you get PCM 384kHz and DSD128. Not an audiophile product, but with audiophile grade specs. Next, you also get exclusive mode (on specific applications that support it like the HiBy app) for bit-perfect listening. This also means that it bypasses the SRC of the device you’re listening to depending on the application.
But arguably the most fascinating thing about the Xeno is the application that allows you to play around with and save EQs in the DAC itself. Think of it as a built-in wired Quedelix 5K in an earphone.
I should note first that the EQ I used was for the PC and is something that only hardcore EQ nerds can use. It is NOT for casual listeners as the application is made for people who do mixing, professionals and the like. But I was also told that there will be a mobile app and you can use to set-up your own EQ. You can also just use HiBy’s own music application to EQ, but any device can do that as long as you have access to the app.
I mentioned that this was a game changer because of the xMems and the supplementary DD. Something I noticed with xMems drivers, whether it’d be TWS like the Creative Aurvana Ace 2 or the Xeno is how well it responds to EQ. Moving the EQ variables on the Xeno is so distinct and varied that, if you had the knowhow, you can tune this to whatever IEM and it’d sound really damn good. I created my own EQ setting for the 0.8 firmware and I loved that thing to death.
But on the topic of sound, how does this thing ACTUALLY sound?
SOUND
One of the things that early adaptors usually suffer from is not having the best implementation. This isn’t even exclusive to audio as the likes of folding phones had problems during their early adoption.
This is unfortunately the case with the xMems of the Xeno as, while it may provide fast transients, great details and rich bass, a lot of tonal quirks make it a rather peculiar set to listen to.
First, I should note that the Xeno was electronically tuned and not physically. This means that the tuning is digital through the DSP paired with the xMems and the other components. I’m not entirely sure of the DD was also tuned that way, but one can speculate.
As for my personal listening experience, I found the Xeno to be somewhat mediocre stock. The bass is a little too bloated and boomy, the mids are colored and recessed and the treble is genuinely all over the place. I can’t really pinpoint what exactly it is that felt so odd about the treble, but it was almost like there are very specific spikes in the tuning that genuinely make it so odd to listen to.
Usage wise, music listening wasn’t really something that I looked forward to in stock tuning and media consumption was just about average. Pair that with the poor fit and it really makes it hard to justify the stock tuning.
But this is where the EQ comes into play and why the Xeno is something that EQ nerds will absolutely love.
One of the benefits of being in the same company as the brand that provides one of the most useful EQ tools is that your product that is almost made to be EQ responds VERY well to this. I first experienced this with the PEQ app that was provided to me by HiBy and ran on my Windows PC. I did the ol’ EQ and measure trick to get my ideal tuning during the 0.8 firmware. And I’m not kidding, this thing sounded amazing. The bass was near perfect and the midrange was silky smooth with great details. The treble was also quite detailed, but was still somewhat barred due to the rather odd dip post 10k. But that was small considering how good the overall tonal balance of this way.
Then I also tried using MSEB and the global PEQ on HiBy apps and, while not as good as the built-in EQ, I was able to nicely adjust the tuning to suit a more casual and considerably easier EQ experience.
The Xeno is fundamentally a casual device in terms of its tuning with the rather unrefined tonality, but can become so much more with the provided EQ apps and the likes
This makes me feel like HiBy Digital wanted to create a blank canvas for casual listeners and so, created an IEM that responds really well to EQ and provided a supplementary app to it
MY PROBLEMS
Unfortunately, I do still have some problems with the device that might cause some people to experience difficulties with the device.First, the whole process of updating the firmware is almost exclusively PC only right now. I’m not going to bank on saying that this is going to be the only method as HiBy has shown that updates can happen OTA or online, so a mobile phone update may be possible. But I had quite the issue when setting up the update app and getting it to update properly.
I’d also mention the bugs, but they often get squished per firmware and currently, I haven't experienced any bugs outside of not knowing how to EQ (aka getting pretty nasty distortion).
But probably my biggest problem, right now, is the EQ app for the PC. It’s so convoluted and complicated that I doubt any casual listener would want to try it or not. Maybe the mobile app will be better, but we won’t really know until it comes. And that’s what I’m waiting for right now. Otherwise, the fundamental existence of the Xeno seems to be hanging on the way side with a complex usage to make it good for a casual device.
WHAT THE FUTURE HOLDS FOR XMEMS
Including the future of audio with DSP, I think there’s a lot for this tech to be properly implemented. The best part about it? It’s probably one firmware update away. The benefit of having a device as digitally reliant as the Xeno, you get to make realistic changes to improve the device through firmware updates.Whether this would be the stock tuning, bug fixes, efficiency or the likes, the Xeno is probably the best platform to push this new audio tech to the masses.
Adding unto that is the xMems driver. I’m not going to deny that this new driver tech might not be totally ready for the masses, but the potential is there. The EQ versatility and the speed of the driver make it probably the most efficient not only for powering it but also for external factors like device battery life, latency and other quality of life improvements.
There are many things to improve, but these are all things that I know can be polished like a continuously update game. And for that, the Xeno could really be the future of audio.
Thank you for reading my full review on the HiBy Digital Xeno. The Xeno is currently in kickstarter and you can support the development here: https://www.kickstarter.com/project...s-hybrid-iems-with-dual-dac-digital-crossover
#hiby #hiby digital #xeno
Last edited:

magnificientako
Thank you for your detailed review. I also like the stock sound settings. I can't say I need the peq feature. But I would expect the crossover divide frequency to be adjusted. Otherwise, the digital active crossover won't have much meaning. I hope they activate that parameter in the future. By the way, where did you get the firmware 0.11 ? I have version 0.8.
Nealz
100+ Head-Fier
Pros: Well extended & sparkly treble
Forward mids with good clarity
Great resolution, imaging and instrument separation
Comes with built-in Dac/Amp
Has driver update support & PEQ Software
Offers 3 tuning options for versatility
Very good microphone performance for calls
Spacious and airy sounding
An all-rounder device
Forward mids with good clarity
Great resolution, imaging and instrument separation
Comes with built-in Dac/Amp
Has driver update support & PEQ Software
Offers 3 tuning options for versatility
Very good microphone performance for calls
Spacious and airy sounding
An all-rounder device
Cons: Build quality could have been better
Not a good fit for me (Subjective)
Stock bright tuning can be fatiguing for some
Needs EQ/PEQ to sound it’s best
Bass rolls off early
Lacks note weight in stock tuning
Cable is not user replaceable
Not a good fit for me (Subjective)
Stock bright tuning can be fatiguing for some
Needs EQ/PEQ to sound it’s best
Bass rolls off early
Lacks note weight in stock tuning
Cable is not user replaceable


Non-affiliated Link:
https://store.hiby.com/products/hib...KQ1bE6WP-QvNly9UVUiqTATPpH-KIj_gjP9hRRC56tfF8






The Basic/Flat Mode: It’s a bright neutral sound signature, with more of an emphasis on treble and has boosted-upper mids. LED indicator blinking green once while accessing this mode using the controller.
Dynamic/Bass Boosted Mode: This tuning is more veiled and warm sounding and tried to boost the low end of the Xeno. But it makes the bass sound more boomy rather than well-extended or textured. The upper-mids emphasis is toned down in this mode.
Gaming/Cinema Mode: This a variation of the basic mode with vocals pushed further back and sounding airier and more spacious. 3D imagining is slightly enhanced as well. Bass and treble performance remains very similar. Although all three tunings each have their own drawbacks, I will focus on the Basic/Flat mode while doing this review. As I find it to be most balanced and superior sounding out of all three.















The Xeno has impressive instrument separation and layering. You can easily pick out individual instruments, such as a bassline, hi-hat, or guitar riff, without any blending or overlap. This clarity enhances your listening experience, especially in genres like rock, jazz, or orchestral music, where multiple instruments are layered together.


Last edited:
S
sendstormer
Is it good iem for uplifting trance or you know a better IEMS for this music genre?
Zerstorer_GOhren
1000+ Head-Fier
Pros: ● Light and durable shells.
● Offers some of the best fitting and comfort.
● MEMS-based solid state speaker drivers show their full potential.
● Implementation of proven Hi-Fi DAC chips for each driver.
● Capable of processing up to 32-bit/384kHz on PCM and up to DSD128 on DSD audio format.
● Intuitive control panel buttons.
● Three tuning presets for tonal versatility.
● The FLAT MODE tuning will probably suit well with adherents of neutral sound signature.
● Warm and rich sound on DYNAMIC MODE
● Clear and shimmering sound profile on GAMING/CINEMATIC MODE.
● Quite competent in technical performance.
● Offers some of the best fitting and comfort.
● MEMS-based solid state speaker drivers show their full potential.
● Implementation of proven Hi-Fi DAC chips for each driver.
● Capable of processing up to 32-bit/384kHz on PCM and up to DSD128 on DSD audio format.
● Intuitive control panel buttons.
● Three tuning presets for tonal versatility.
● The FLAT MODE tuning will probably suit well with adherents of neutral sound signature.
● Warm and rich sound on DYNAMIC MODE
● Clear and shimmering sound profile on GAMING/CINEMATIC MODE.
● Quite competent in technical performance.
Cons: ● Limited usage due to its termination choice as you can only use it on devices with USB Type-C port.
● Might be too warm and dark sounding on a DYNAMIC MODE setting.
● While this one is a breakthrough device, it is still considered as a niche one in definition.
● Might be too warm and dark sounding on a DYNAMIC MODE setting.
● While this one is a breakthrough device, it is still considered as a niche one in definition.

The word XENO is a Greek word for foreign, exotic or alien. The model name for this unit truly fits its description on how this set is quite unique in the audio market.
HIBY is one of the audio companies that offers a diversifying portfolio of audio products in the audio market from affordable IEM earphones up to the premium DAPs. It is also noted that HiBy is also known for being innovative by implementing some new audio technologies on their every product release.

What I have here right now is their latest product and this one is quite a unique set. This is HIBY XENO, it has a dual driver technology inside with a hifi DAC chip for each driver to give a better crossover to achieve that detailed full range sound quality.

What makes this set quite so unique was the implementation of a Cowell MEMS speaker driver from XMEMs along with a 10mm dynamic driver with a graphene diaphragm. MEMS are miniaturised fabricated devices which have electromechanical components which is an essential part of modern technologies from automobiles up to wearable devices like digital watches and medical monitoring sensors, and as MEMS technology keeps progressing, it develop some new audio technology like solid-state MEMs speaker driver in which is more responsive and minimises any possible phase shifting issues. As for the dynamic driver with a graphene material, graphenes are a type of nanomaterials known for its thinnest with excellent tensile strength for better vibration control that will provide a solid and full range sound with better resolution.




Aside from the drivers, HIBY also implemented two different hi-fi DAC ICs for each driver due to their different frequency properties and HiBy was able to achieve it as this set produces a cohesive sound quality. These two hi-fi DAC chips are ESS ES9018C2M and Cirrus Logic CS43131, and both ICs are proven and tested for excellent audio processing capabilities and they work in tandem to decode high resolution audio up to 32-bit 384kHz on PCM format and DSD128 on DSD format.


The drivers were encapsulated in a 3D-moulded resin shell chassis with an acoustic cavity structure for each driver in an aluminium alloy material to lessened vibrations from acoustic waves. The shell sizes are quite compact that make this set a versatile one in terms of fitting and comfort to all ear sizes as it offers a good passive noise isolation that blocks unwanted external noises.



While it doesn't have a detachable cable feature, HIBY uses a silver-plated copper cable with fabric-like sheathing insulator for better audio signal transmission on digital audio connection. On its termination, it uses a USB TYPE-C which is a more standard digital audio connection on modern mobile devices like smartphones, laptops and tablets.

The HIBY XENO has a console panel with four directional button controls for play/pause, volume up, volume down and tonal presets. The tonal presets mode will correspond via blinks of its LED light; these are Flat or user defined mode for a single blink, Dynamic mode for double blinking and Gaming/Cinema mode for three blinks. Take note that these settings will not work on DSD MODE. The volume control of this one has finer increments on how it corresponds with its loudness level.


Aside from button controls, it has a built-in high definition omnidirectional MEMS microphone capable of supporting incoming calls and recording.

Since this one is a sample review unit, this set has basic inclusions like silicone ear tips and a PU-leather pouch for storage.


To analyse its tonal profile, since this set has three tonal presets and each of its presets have a distinctive sound signature that makes this set truly a versatile one for both critical and casual listening.
FLAT MODE - it has a balanced-neutral sound signature.
DYNAMIC MODE - it has a more u-shaped sound signature with more noticeable emphasis on the low frequency.
GAMING/CINEMATIC MODE - it has a V-shaped signature but it gives that sort of wider sound/speaker stage feel.
I will conduct testing on this unit with HiBy Music App on my mobile phones without using any EQs.

LOWS/BASS:
FLAT MODE
The bass response of this one is rather tight and precise with a noticeable rumble on its sub bass and with enough mid-bass texture. This tuning mode will give a cleaner bass quality on how it delivers a good separation from other frequency ranges.
DYNAMIC MODE
It has a more pronounced bass response as it sounds more punchy, impactful and fuller compared to the FLAT MODE but at the expense of mid bass bleeding. This setting focuses more on mid bass presence for better note weight on bass-clef instruments and deep male vocals as bass guitars and double basses will sound more weighty and broad while bass kick drums sounds full and sonorous, and then on both bass and bass-baritone vocals, they have this dusky and dense sounding voices.
GAMING/CINEMATIC MODE
Compared to the DYNAMIC MODE, it has a less mid-bass texture but it still has a sufficient texture unlike the FLAT MODE. It still retains a punchy and tactile bass response but apparently it delivers a more incisive bass quality. It affects the sound characteristics on bass-clef instruments and deep male vocals like the bass guitars and double basses will sound more resonant yet mellow, bass kick drums sounds more sustaining a bit hollow, and male vocals like bass and bass-baritones will sound less deep, less darker but retains some resonant sound on them.
MIDRANGE:
FLAT MODE
The midrange presentation of one is definitely a neutral, linear, well-balanced and very transparent sounding as both male and female vocals sound natural without unnecessary colouration on their respective tonal characteristics. Same as instruments as they sound faithfully as it was intended on the recording. This type of tuning will be likely more suited on studio recordings and mastering.
DYNAMIC MODE
This midrange presentation of this setting is noticeably more recessed but the mid bass smearing adds more warmth and texture for full and rich sound on most male vocals and instruments like brasses and percussions. On male vocals, baritones have lush and warm voices while tenors have brassy but less spicy voices and countertenors have smooth and plush sound which I think isn't the exact tonal colour that I'm hearing. Female contraltos have rich and heft with their chesty vocals which really give more engaging sound and then on instruments, brasses like trumpets, trombones and horns correspondingly sounds fuller, overpowering and muffled. On percussion, snare drums slam harder but less brighter, tom-toms sound too warm and resonant and field drums sound dark and booming.
GAMING/CINEMATIC MODE
Apparently, the midrange presentation of this one seems a bit leaner in texture compared to the DYNAMIC MODE but it sounds more energetic, clearer and transparent. As it lessens the warmth that affects the volume and tonal colour of male vocals and instruments particularly brasses, some female vocals and instruments like woodwinds and strings will sound more crisper and a tad more gleaming. On female vocals, mezzo-sopranos sound fiery while sopranos have silvery and metallic vocals on them. Woodwinds like concert flutes, piccolos, clarinets and saxophone, they sound bright, brilliant, shrill and reedy respectively, and as for string instruments, acoustic guitars sound bright, violins have a lively and metallic sound, and then, cellos sound more vibrant. Pianos on this setting sound brighter with some tininess tone on it.
HIGHS/TREBLE:
FLAT MODE
The treble response of this setting appears to be neutral and smooth as it doesn't sound dark or too bright. There's no hint of harshness nor sibilance on this one but still can deliver a good definition on vocals and treble-clef instruments and It has a relatively airy presence on its brilliance section.
DYNAMIC MODE
The treble quality on this one is that it sounds smooth and inoffensive to the point that treble heads might consider it a bit dark and muffled sounding to their liking. Harshness and sibilance will be an out of question as how the upper mids up to the presence treble region was evened and smoothen but I noticed that quantity of the treble air is rather modest in my opinion. In some instruments, cymbals have a rather dark and dry sounding in my opinion while glockenspiels sound too lustrous as it actually reminds me more of a marimba and then, the celestas sound too rounder and warmer in my opinion that it should have a bright sound with longer resonance.
GAMING/CINEMATIC MODE
Compared to the two previous setting modes, the upper-mids and presence part of this one is noticeably accentuated as it has more definition and clarity for vocals and attack of instruments. In that regard, the treble response of this setting is a tad brighter and it somehow retains the airy extension quantity of the FLAT MODE. Cymbals have a sizzling sound while glockenspiels sound brilliant and glistening, and then, celestas have a shimmering and golden sound.
SOUNDSTAGE, IMAGING AND OTHER TECHNICALITIES:
FLAT MODE
In this mode, it projects a moderately spacious sound field dimensions as it has an above-average lateral span on its width, good height and depth. It presents a concave-like stereo presentation in a decently layered soundscape in which I can decently pinpoint the exact positions of specific vocals and instruments. This set is also quite resolving on both macro-dynamics and micro-dynamics as the former has a solidity and depth on its compression of its note weight and the latter can extract some micro-details and other nuances in a sonic background.
DYNAMIC MODE
It appears that the perceived sound/speaker stage of this one is a tad narrower as that width and height were a bit reduced but somehow, it adds more depth. While it has the same stereo imaging projection like the FLAT MODE, it somehow affects the layering aspect of this one as it sounds a bit less disorganised that I'm sort of struggling to pinpoint the placements of vocals and instruments. On resolution capability, while it lessened the proficiency its micro-detail retrieval but it gives more definition on macro-dynamics
GAMING/CINEMATIC MODE
Due to elevation on the upper-mids and presence of the treble region, it gives that illusion that the sound/speaker stage of this setting mode projects a tad wider and better height to give that roomy head room in my aural perception. It appears that it has a similar stereo imaging presentation with the FLAT MODE but I just noticed that it's more resolving on resolution capability.
As I conclude my review of this model, this set is indeed quite a unique one and this is the first that I've experienced the sound quality that was produced by a recently developed driver technology which is a MEMS-based speaker driver. The MEMS truly shows its capability and versatility that HIBY was able to utilise its full potential with its proven track record for being an innovative audio company. While the HIBY XENO is a rather new concept that some audio enthusiasts might be hesitant at first instance due to the unusual digital connector which is a USB Type-C as they are more accustomed with analogue 3.5mm single ended, but if they ever test this one, the sound quality speaks for itself on how it performs. I hope that HIBY will implement the MEMS driver to their future standard IEM earphones.
HIBY XENO is now available at HIBY Official Store, check out the link below that I have provided for those who are interested to try it out.
LINK: https://store.hiby.com/products/hibydigitalxeno?srsltid=AfmBOooIAwZzFIJyedxlcmlHMQeYYyjeEUCDMKRctYLQA9nAOgmzEOSS

SPECIFICATION:
MODEL: HIBY XENO
IMPEDANCE: Unspecified
SENSITIVITY: 116dB
FREQUENCY RESPONSE: 20Hz – 40KHz
CABLE LENGTH: 1.2m
PIN TYPE: **NON-DETACHABLE**
PLUG TYPE: USB TYPE-C
DRIVER UNIT(S): (1) DYNAMIC DRIVER, (1) MEMS SPEAKER DRIVER
Tracks Tested: ( * = 16-bit FLAC, ** = 24-bit FLAC, *'* = MQA, '*' = DSD, *'= .WAV)
Alison Krauss -When You Say Nothing At All *
Jade Wiedlin - Blue Kiss**
Led Zeppelin - When The Levee Breaks **
Mountain - Mississippi Queen *
Queen - Killer Queen **
Guns N' Roses - Patience *'*
Eric Clapton - Tears in Heaven '*'
Sergio Mendes- Never Gonna Let You Go '*'
Pearl Jam - Daughter **
Roselia - Hidamari Rhodonite *
Assassin - Fight (To Stop The Tyranny)*
Celtic Frost- Visual Aggression *
New Order - Blue Monday *
The Corrs- What Can I do (unplugged version) *
Jimi Hendrix Experience - Voodoo Child *
The Madness- Buggy Trousers *
Metallica - Motorbreath **
Mariah Carey- Always Be My Baby *
Destiny's Child - Say My Name *
Malice Mizer- Au Revoir *
Mozart - Lacrimosa *
New York Philharmonic Orchestra - Dvorak- Symphony 9 " From the New World." *
Eva Cassidy - Fields of Gold (Sting cover)*
Michael Jackson - Give In To Me *
Exciter - Violence and Force *
Diana Krall - Stop This World **
Debbie Gibson - Foolish Beat *'*
The Sisters of Mercy – Lucretia My Reflection**
Suzanne Vega – Luka **
Lauren Christy – Steep *
Ottoman Mehter - Hucum Marsi *
Diana Damrau - Mozart: Die Zauberflöte*
Type O Negative - Black No.1 *
Felix Ayo - Vivaldi: Presto **
Three Tenors - Nessum Dorma *
Mercyful Fate - Witches' Dance *
P.S.
I am not affiliated to HIBY nor receive monetary incentives and financial gains as they provide me a review unit for an exchange of factual and sincere feedback from yours truly.
Once again, I would like to send my gratitude to MR. JOSEPH YEUNG for providing this review unit. I truly appreciate his generosity and trust towards me and other reviewers.




Last edited:
o0genesis0o
Headphoneus Supremus
Pros: + Impressive treble precision and imaging of MEMS driver
+ The ability to retune the IEM with a PEQ profile
+ Thumpy bass response
+ The ability to retune the IEM with a PEQ profile
+ Thumpy bass response
Cons: - Quite difficult to fit due to the short nozzles
- Treble is uneven, making EQ quite challenging
- Sub-bass roll off
- The stock tuning is rather old-school
- Treble is uneven, making EQ quite challenging
- Sub-bass roll off
- The stock tuning is rather old-school
What would the future of personal audio look like? Yes, we all know true-wireless stereo earphones (TWS) are taking over, pushing wired IEMs further and further into a niche market. But how about the future of wired IEMs themselves? What would be the next step? Today, we look at HiBy Xeno to catch of glimpse of a possible future.
Let’s breakdown the technologies behind Xeno. On the acoustic side, Xeno features a hybrid two-driver topology with one full-range DD and a MEMS tweeter. The DD is a custom-made unit containing a 10mm diaphragm made from graphene sheets. The design goal of this driver was to minimize the split vibration of the diaphragm in order to achieve a higher resolution (simply put, to reduce the “smearing” of musical notes). I think we have seen the promise of more resolving DD every single time a new single DD IEM is released, which brings a new “state of the art” diaphragm material from Beryllium to Titanium to Diamond-like Carbon to more exotic alloys like “purple gold”. Therefore, my enthusiam for the DD was … controlled.
Where Xeno gets interesting is the MEMS tweeter. As you know, the point of any transducer is to move a mass according to an incoming electrical signal to create sound waves. Traditional drivers like DD relies on electrical coils wrapping around a magnet to move a diaphragm in order to make sound. MEMS drivers, also known as solid-state drivers, instead relies on piezoelectric materials which can shrink or expand when excited by electrical energy. By mounting a layer of piezoelectric crystal on a substrate like a silicon plate, we can create a spring-like structure that bends up and down according to incoming electrical signals. In other words, we create a transducer or speaker.
You may ask: “That’s cool and all, but what’s the point?” For me, there are two exciting things about MEMS drivers. Firstly, MEMS drivers enable the transition from assembling of drivers from multple moving parts to fabricating them in a lab-like environment, which means higher precision, tighter quality control, and eventually lower cost. Secondly, and perhaps the most important reason, is the potential of a leap in sound quality. “How?” The treble response, particularly the upper treble. As you know, both the amount and the precision of upper treble plays a significant role in creating what we dub “technical performance” of IEMs. Producing upper treble, in turn, requires drivers to move very fast and react quickly. By removing all the moving parts attached to the diaphragm, MEMS drivers are very light and thus they can move fast. As a result, their treble response is rather impressive, as we would discuss later in this review.
Let’s return to Xeno. The MEMS driver being used here is Cowell (likely model XSC-2100) from the US manufacturer xMEMS. Output from the DD and MEMS driver are further shaped by 3D printed cavity and something HiBy calls “LSW metal chamber”. When you overlay the frequency response of Xeno with that of Cowell (above, measured with a IEC711 coupler), you can clearly see where the Cowell driver takes over the frequency response. Interestingly, xMEMS emphasised that most of the dips and peaks on the graph are due to the acoustic impedance of the coupler itself.
Readers with keen eyes would also notice an interesting number: +10 Volts bias. And you are right, these MEMS drivers require higher voltage than usual drivers, making pairing them with normal drivers quite challenging. HiBy’s solution is to use two separate signal paths with independent DAC and amp to drive the DD and the MEMS driver. In particular, Xeno contains two familiar DAC chips, the ES9018C2M and CS43131, each of which independently decode and amplify the signals. An active crossover is included to control the, well, crossover between two signal paths. You can also shape the signal with onboard parametric EQ. Xeno does not support other DSP plugins that can be found on HiBy DAPs. On the plus side, the (lack of) latency on Xeno is excellent in case you plan to use this IEM for gaming.
Speaking of gaming, Xeno also has a microphone built into the wire splitter. It works decently, albeit a bit too quiet and can pick up noise of the splitter rubbing against clothes.
Design The earpieces of Xeno are very simple and light, possibly due to the fixed cable design. Each earpiece is made up of a 3D printed component that holds all drivers and 3D printed acoustic chambers and a plastic faceplate. Here lies my first criticism of Xeno’s aesthetic: the material used for the faceplate feels cheap, which in turn cheapens the design of whole earpieces. I know that costs and complexity must be minimized for this IEM, but I think a bit visual flair even in form of a plastic faceplate with polished clear coating to match the already nice build quality of the 3D printed part would elevate the whole design.
A major design element of Xeno is the large wire splitter where all electronics, microphone, and control buttons are held. The “X” design motif of Xeno is featured prominently on the splitter. At four corners of the X letter are four buttons for changing volume, controlling playback, and changing sound profile. I will discuss more about them later.
The cables used by Xeno are silver-plated Oxygen-free Copper (OFC) cable which is shielded to avoid external interference. The cable is rather stiff and can hold shape if you bend it, similarly to solid core cables such as Effect Audio CODE23. On the plus side, the cable does not tangle, does not coil upon itself, and is generally well behaved.
Fit, comfort and isolation The short nozzles of Xeno make achieving a good fit with this IEM rather tricky. I could not achieve a fit at all with the stock tips. Majority of my trusted tips such as Divinus Velvet, Tangzu Sancai, and SpinFit W1 did not work at all. The fit was only barely acceptable with Azla Xelastec tips. Only when I switched to the stock silicone tips of AFUL IEMs that I finally achieve a stable fit. When the fit is good, I find that Xeno is quite comfortable in long listening session due to the generous use of pressure release vents. Noise isolation, on the other hand, suffers.
Ear tips recommendation: Achieving a good with IEMs with short nozzles like Xeno generaly requires longer eartips to compensate. Still, I think you might need to exeriment with eartips more than usual with Xeno. Achieving a deep and stable fit is significant for an IEM with strong treble extension such as Xeno.
It should be noted that Xeno completely bypasses the volume settings on the source device. For instance, I can change the volume slider on both my MacBook and my R3II music player without changing the output volume of Xeno. Instead, I need to use the “+” and “-“ buttons on the wire splitter to control the volume. Since Xeno can get dangerously loud, it is a good practice to lower the volume to lower the volume and start music before putting the earpieces in your ears, just in case of any software mishaps. HiBy should implements a volume indicator in future revision. For instance, Chord Mojo2 uses the colour of the LED lights in its buttons as volume indicator.
The “O” button on the wire splitter controls the tuning mode of Xeno. Pressing this button circulates between 3 modes. Unfortunately, due to some unknown firmware problem, that dynamic and gaming modes sound and measure identically to the hifi mode on my unit.
Here is my suggested workflow for “making your own IEM” with Xeno, using my graph database:
Timbre: It is helpful to think of an IEM as a filter that highlights or subdues different parts of the incoming audio signal. This effect can be measured objectively by the squiggly lines below, called Frequency Response (FR) graphs, which measure how loud an IEM is at different frequencies from 20Hz (bass) to 20kHz (upper treble). Subjectivity is how your ears and brain interpret the effect of that filter on your music and decide whether it is “enjoyable.” There are some “rules of thumb” when it comes to tonality, but most interesting IEMs usually bend the rules masterfully.
Figure shows the frequency response of Xeno against the Harman in-ear target. Measurements were done with an IEC-711-compliant coupler and might only be compared with other measurements from this same coupler. Above 8kHz, the measurement likely does not match the response at the ear drum. Visit my graph database for more comparisons.
Since Xeno has many sound modes, I will focus on the default “Hifi” mode. The best way to describe the stock tuning of Xeno would be “old-school V-shaped.” Xeno eschews the modern bass shelf and clean lower midrange tuning and goes for a bass “hump” that extends all the way to 1kHz. The bass “hump” is balanced by a correct ear-gain boost that starts from 1kHz and peaks at around 2.5kHz before gently rolls off after 4kHz. Where Xeno exhibits restraint compared to true V-shaped IEMs is the amount of bass boost and upper midrange boost, both of which are kept at 10dB or less. As a result, the hifi mode of Xeno makes most recordings sound energetic without becoming uncomfortably so.
The V-shaped tuning of Xeno also imparts a coloring on its midrange. All voices and instruments, particularly male vocals and cellos, have additional warmth and thickness. At the same time, the upper midrange boost with a strong peak at 2.5khz ensures that higher notes, particularly female vocals, can cut through the “veil” created by the lower midrange. Depending on recordings and your preference, this colouring can be pleasant or annoying. For me, I enjoy this tuning on some pop music, such as Ed Sheeran. It also works with some electronic music and classical recordings featuring cellos. However, I think the presentation is rather imbalanced and reduce the authenticity of piano and large orchestral recordings with multiple instruments.
Moving up the frequency range, we can find a valley at 6kHz where the MEMS driver takes over from the DD. Whilst the treble frequencies look rather unpleasant on the frequency response graph, they are surprisingly less offensive in real world listening. Yes, you can hear certain gaps in the treble, making some parts of high pitched instruments more prominent whilst others are a bit subdued. The imbalance between various frequencies making up the treble response also makes the timbre of Xeno suffer with some tracks. However, there are also positive aspects, such as a lack of the usual 5-6kHz harshness due to the dip in this region. The way you fit Xeno in your ear canal would play a significant role in how you perceive the treble. Another advantage is the sheer quality and resolution of the treble region, which brings about many advantages in terms of “technical performance”, which we will discuss further in the following sections.
Where do the tonality of Xeno fits in the grand scheme? To me, the stock tuning, whilst being rather pleasant and interesting, lacks certain refinement due to the uneven treble response. The V-shape colouring of the midrange also negatively impacts some recordings where accuracy is required. In summary, I consider tonality 3/5 (Good). At the end of the day, it does not really matter given how EQ is so seamless and integrated part of the experience with Xeno.
Bass and perceived dynamic:
Another area where Xeno eschews the modern tuning is the bass response. When most IEMs focus on sub-bass region and ignore the mid-bass, Xeno does the opposite. I presure that this is a necessary trade-off, as full range DD generally does not do subbass well compared to, say, the DD subwoofer used in the flagship HiBy Zeta. Still, the mid-bass focus response does have a few advantages, which are intensified by the nice quality of the 10mm graphene DD.
The first advantage is the overall sense of precision and incisiveness of bass attacks. Whilst Xeno does not have razor sharp bass transients like the modern Balanced Armature (BA) woofers implementation, Xeno’s bass still feels tight with minimal smearing. Moreover, the bass of Xeno also feels powerful and punchy, as if every kick, every pluck of the bass guitar has a weight behind it. Unlike sub-bass focused IEMs where kicks create a physical sensation deeper down in my throat, the physical punch of Xeno feels more like air being pushed against my ear drums. Beside power, Xeno also does a great job at revealing details and textures of the bass line, which are particularly audible with bass guitars and acoustic basses.
Regarding dynamic, I find Xeno to be quite lively and can convey dynamic swings such as the crescendo at 01:10 in A Reckoning in Blood from The Ghost of Tsushima OST. Interestingly, the bass quality of Xeno remains consistent across EQ profiles. Speaking of EQ, the Xeno’s DD can some boosting, but I found that the best strategy is to lean onto the mid-bass centric nature of the driver rather than trying to push the sub-bass up.
In summary, even though the bass of Xeno does not offer as much sub-bass rumble as average IEMs in 2024, Xeno still manages to offer a nice bass experience thanks to the punchy, dynamic, and surprisingly textured bass. 3/5 - Great.
Resolution: To me, “resolution” can be broken down into three components: (1) Sharpness, incisiveness, or “definition” of note attacks (see the figure above). (2) The separation of instruments and vocals, especially when they overlap on the soundstage. (3) The texture and details in the decay side of the notes. The first two give music clarity and make it easy to track individual elements of a mix. The last provides music details and nuances.
Resolution is where the MEMS drivers flex their capability. I’m not talking about the “fake” resolution achieved by adding treble peaks to artificially sharpen the notes (though the stock tuning of Xeno certainly does have quite a few peaks), a trick commonly found in lower-end DD and some full-range planar IEMs. The problem with this “fake” resolution is that it falls apart the moment music gets busy with overlapping elements or when you actually pay attention more than cursory listening. No, I’m talking about the true ability of an IEM to incisively start the note where it starts and end where it ends.
“Precise” would be the most suitable adjective to describe the presentation of Xeno, particularly the way it handles the treble region. Musical notes, especially higher ones in upper midrange and treble region, feel crisp and clear. At the same time, the decay ends of the note is quite rich in detail. Sparse recordings such as Ciaccona from Bach’s Violin Partita No. 2 in D Minor, performed by Kavakos is where the MEMS driver flexes these qualities. I quite enjoy micro details such as the bow catching the strings. I am also impressed by the quality and nuances of the reverberation and decays of the violin in the recording hall. It’s hard to really convey by words, but the treble response of these MEMS drivers feel effortless and clear with minimal smearing, making them feels “fast”. In fact, I found that the incisiveness of trebleof Xeno is very close to, if not slightly better than, my current benchmark, the AFUL Cantor (5/5 in resolution), in back to back A/B tests. In terms of detail retrieval, Xeno starts to fall behind due to both the uneven treble which maskes some details and perhaps also due to the less resolving nature of the full range DD.
The full range DD of Xeno is, surprisingly, quite competitive against some “mid-fi” IEMs with multi-BA set up. For instance, when I listen to the “controlled chaos” ABC feat. Sophia Black by Polyphia, I find that Xeno does a nice job at separating elements of this busy track, making it rather easy for me to track individual elements. Whilst Xeno does not achieve the same effortlessness of Cantor, I found that it does a better job than my venerable Moondrop Blessing 2 (3/5 in resolution) in back to back A/B tests.
In summary, I found the MEMS driver in Xeno quite impressive when it comes to treble quality, but it is held back by the uneven frequency response and the good-but-not-spectacular full range DD. When these kinks are ironed out, MEMS-based IEMs could present a big leap in technical performance over the IEMs performance we know today. 4/5 - Great.
Stereo imaging and soundstage: Stereo imaging or “soundstage” is a psychoacoustic illusion that different recording elements appear at various locations inside and around your head. Your brain creates based on the cues in the recording, which are enhanced or diminushed by your IEMs, your DAC, and your amplifier. In rare cases, with some specific songs, some IEMs can trick you into thinking that the sound comes from the environment (a.k.a., “holographic”)
Another area where MEMS driver excel is stereo imaging. Simply put, they are spectacularly precise in how they place sound elements within the virtual soundstage, be it left-to-right or near-to-far or low-to-high. For example, when I listen to Original Sound Effect Track - Memory from Gundam Seed Destiny OST album, a compilation of all sound effects used in the show arranged in an atmospheric and immersive way, Xeno makes me feel like I sit in the middle of a busy battleship preparing to enter the battle, with sound effects popping everywhere inside and around my head with a 3D feel to the presentation. The sense of distance is also properly conveyed in tracks such as Shadow of Baar Dau, creating a spacious and immersive experience. These qualities also translate to excellent localisation ability in FPS gaming. For example, when I listen to my usual CS:GO recording for testing IEMs, I found that I can pin point both the local and distance of the sound in all direction with a precision level that is rarely achieved by traditional IEMs. 5/5 - Outstanding.
Who should get Xeno? Whilst HiBy pitches the IEM as a product for casual listeners, I think the most suitable users of Xeno are hardcore IEM fans, especially those who like to tweak and customise IEMs. With Xeno, you have a superb foundation, thanks to the MEMS driver, to tune that dream IEMs that you have been imaging but lacking the clout to make a collaboration IEM with a manufacturer.
What I like about this IEM:
Bias Score: 4/5 - I like this IEM
Updated: October 5, 2024

Forewords
- What I look for in an IEM is immersion. I want to feel the orchestra around my head, track individual instruments, and hear all of their textures and details. I’m not picky about tonality, as long as it does not make the orchestra, violin, cellos, and pianos sound wrong.
- I rate IEMs within with a consistent scale from 1 (Poor) to 3 (Good) to 5 (Outstanding). An overall ranking of 3/5 or above is considered positive.
- Ranking list and measurement database are on my IEM review blog.
- The terminology for subjective impressions in this review is based on the Audio Wheel for reproduced sound defined in the technical report ITU-R BS.2399-0
- This review is based on a preproduction unit from HiBy (Thank you!). I have no affiliation with or financial interest in HiBy.
- The retail price of Xeno is unknown by the time this review was writtein. Unaffiliated link: HiBy online store
General Information
Xeno is a budget-friendly IEM released under the “Digital” product line of HiBy. What makes it special is the fact that it is not just another budget-friendly IEM with a single dynamic driver (DD) and a competent (if not trendy) frequency response to pair with their own budget-friendly DAP M300. No, what makes Xeno special and interesting is the fact that it is also somewhat a testbed for some cutting edge engineering techniques and technologies regarding acoustic design, electronics, and digital signal processing.Let’s breakdown the technologies behind Xeno. On the acoustic side, Xeno features a hybrid two-driver topology with one full-range DD and a MEMS tweeter. The DD is a custom-made unit containing a 10mm diaphragm made from graphene sheets. The design goal of this driver was to minimize the split vibration of the diaphragm in order to achieve a higher resolution (simply put, to reduce the “smearing” of musical notes). I think we have seen the promise of more resolving DD every single time a new single DD IEM is released, which brings a new “state of the art” diaphragm material from Beryllium to Titanium to Diamond-like Carbon to more exotic alloys like “purple gold”. Therefore, my enthusiam for the DD was … controlled.

Where Xeno gets interesting is the MEMS tweeter. As you know, the point of any transducer is to move a mass according to an incoming electrical signal to create sound waves. Traditional drivers like DD relies on electrical coils wrapping around a magnet to move a diaphragm in order to make sound. MEMS drivers, also known as solid-state drivers, instead relies on piezoelectric materials which can shrink or expand when excited by electrical energy. By mounting a layer of piezoelectric crystal on a substrate like a silicon plate, we can create a spring-like structure that bends up and down according to incoming electrical signals. In other words, we create a transducer or speaker.
You may ask: “That’s cool and all, but what’s the point?” For me, there are two exciting things about MEMS drivers. Firstly, MEMS drivers enable the transition from assembling of drivers from multple moving parts to fabricating them in a lab-like environment, which means higher precision, tighter quality control, and eventually lower cost. Secondly, and perhaps the most important reason, is the potential of a leap in sound quality. “How?” The treble response, particularly the upper treble. As you know, both the amount and the precision of upper treble plays a significant role in creating what we dub “technical performance” of IEMs. Producing upper treble, in turn, requires drivers to move very fast and react quickly. By removing all the moving parts attached to the diaphragm, MEMS drivers are very light and thus they can move fast. As a result, their treble response is rather impressive, as we would discuss later in this review.
Let’s return to Xeno. The MEMS driver being used here is Cowell (likely model XSC-2100) from the US manufacturer xMEMS. Output from the DD and MEMS driver are further shaped by 3D printed cavity and something HiBy calls “LSW metal chamber”. When you overlay the frequency response of Xeno with that of Cowell (above, measured with a IEC711 coupler), you can clearly see where the Cowell driver takes over the frequency response. Interestingly, xMEMS emphasised that most of the dips and peaks on the graph are due to the acoustic impedance of the coupler itself.
Readers with keen eyes would also notice an interesting number: +10 Volts bias. And you are right, these MEMS drivers require higher voltage than usual drivers, making pairing them with normal drivers quite challenging. HiBy’s solution is to use two separate signal paths with independent DAC and amp to drive the DD and the MEMS driver. In particular, Xeno contains two familiar DAC chips, the ES9018C2M and CS43131, each of which independently decode and amplify the signals. An active crossover is included to control the, well, crossover between two signal paths. You can also shape the signal with onboard parametric EQ. Xeno does not support other DSP plugins that can be found on HiBy DAPs. On the plus side, the (lack of) latency on Xeno is excellent in case you plan to use this IEM for gaming.

Speaking of gaming, Xeno also has a microphone built into the wire splitter. It works decently, albeit a bit too quiet and can pick up noise of the splitter rubbing against clothes.
Non-sound Aspects
Packaging and accessories My preproduction unit came in a snazzy … bubble wrap. Accessories include a faux leather envelop for storing the IEM and a set of generic silicone ear tips. I was told that the retail unit would include a clip to attach the wire splitter to the clothes to reduce microphonic.


Design The earpieces of Xeno are very simple and light, possibly due to the fixed cable design. Each earpiece is made up of a 3D printed component that holds all drivers and 3D printed acoustic chambers and a plastic faceplate. Here lies my first criticism of Xeno’s aesthetic: the material used for the faceplate feels cheap, which in turn cheapens the design of whole earpieces. I know that costs and complexity must be minimized for this IEM, but I think a bit visual flair even in form of a plastic faceplate with polished clear coating to match the already nice build quality of the 3D printed part would elevate the whole design.
A major design element of Xeno is the large wire splitter where all electronics, microphone, and control buttons are held. The “X” design motif of Xeno is featured prominently on the splitter. At four corners of the X letter are four buttons for changing volume, controlling playback, and changing sound profile. I will discuss more about them later.
The cables used by Xeno are silver-plated Oxygen-free Copper (OFC) cable which is shielded to avoid external interference. The cable is rather stiff and can hold shape if you bend it, similarly to solid core cables such as Effect Audio CODE23. On the plus side, the cable does not tangle, does not coil upon itself, and is generally well behaved.
Fit, comfort and isolation The short nozzles of Xeno make achieving a good fit with this IEM rather tricky. I could not achieve a fit at all with the stock tips. Majority of my trusted tips such as Divinus Velvet, Tangzu Sancai, and SpinFit W1 did not work at all. The fit was only barely acceptable with Azla Xelastec tips. Only when I switched to the stock silicone tips of AFUL IEMs that I finally achieve a stable fit. When the fit is good, I find that Xeno is quite comfortable in long listening session due to the generous use of pressure release vents. Noise isolation, on the other hand, suffers.



Ear tips recommendation: Achieving a good with IEMs with short nozzles like Xeno generaly requires longer eartips to compensate. Still, I think you might need to exeriment with eartips more than usual with Xeno. Achieving a deep and stable fit is significant for an IEM with strong treble extension such as Xeno.
How to use Xeno
Xeno has built in DAC, so you only need to attach the USB-C connector of this IEM to your source device and choose Xeno as the output device to start using the IEM. You can start and stop music with the play button on the wire splitter.It should be noted that Xeno completely bypasses the volume settings on the source device. For instance, I can change the volume slider on both my MacBook and my R3II music player without changing the output volume of Xeno. Instead, I need to use the “+” and “-“ buttons on the wire splitter to control the volume. Since Xeno can get dangerously loud, it is a good practice to lower the volume to lower the volume and start music before putting the earpieces in your ears, just in case of any software mishaps. HiBy should implements a volume indicator in future revision. For instance, Chord Mojo2 uses the colour of the LED lights in its buttons as volume indicator.

The “O” button on the wire splitter controls the tuning mode of Xeno. Pressing this button circulates between 3 modes. Unfortunately, due to some unknown firmware problem, that dynamic and gaming modes sound and measure identically to the hifi mode on my unit.
- Hifi mode: LED indicator blinking green once. This mode can be customised user-defined EQ profile.
- Dynamic mode: LED indicator blinking orange twice.
- Gaming mode: LED indicator blinking purple three times.

Here is my suggested workflow for “making your own IEM” with Xeno, using my graph database:
- Open up my graph tool with Xeno response
- Add the IEM you want Xeno to match
- Open the equalizer tab and click “AutoEQ”
- Copy all the filters from the graph tool to HiBy PEQ Tool and save the profile to Xeno
- (Optional) Verify the response between 150Hz and 5kHz of Xeno using an IEC711 coupler to ensure that the EQ has been applied correctly
- Adjust the treble filters according to your ears. You need to pay attention to the shout (2-3kHz), lower sibilance and harshness (5-6kHz), sibilance and pierce (8kHz), and metallic sheen (12kHz). Carefully adjust the filters to balance between treble detail and harshness.
Sonic Performance
Testing setup:- Sources: MacBook Pro, iPad Pro, DX300, R3II
- Cable: stock cable (duh!)
- Ear tips: AFUL silicone eartips

Timbre: It is helpful to think of an IEM as a filter that highlights or subdues different parts of the incoming audio signal. This effect can be measured objectively by the squiggly lines below, called Frequency Response (FR) graphs, which measure how loud an IEM is at different frequencies from 20Hz (bass) to 20kHz (upper treble). Subjectivity is how your ears and brain interpret the effect of that filter on your music and decide whether it is “enjoyable.” There are some “rules of thumb” when it comes to tonality, but most interesting IEMs usually bend the rules masterfully.

Figure shows the frequency response of Xeno against the Harman in-ear target. Measurements were done with an IEC-711-compliant coupler and might only be compared with other measurements from this same coupler. Above 8kHz, the measurement likely does not match the response at the ear drum. Visit my graph database for more comparisons.
Since Xeno has many sound modes, I will focus on the default “Hifi” mode. The best way to describe the stock tuning of Xeno would be “old-school V-shaped.” Xeno eschews the modern bass shelf and clean lower midrange tuning and goes for a bass “hump” that extends all the way to 1kHz. The bass “hump” is balanced by a correct ear-gain boost that starts from 1kHz and peaks at around 2.5kHz before gently rolls off after 4kHz. Where Xeno exhibits restraint compared to true V-shaped IEMs is the amount of bass boost and upper midrange boost, both of which are kept at 10dB or less. As a result, the hifi mode of Xeno makes most recordings sound energetic without becoming uncomfortably so.
The V-shaped tuning of Xeno also imparts a coloring on its midrange. All voices and instruments, particularly male vocals and cellos, have additional warmth and thickness. At the same time, the upper midrange boost with a strong peak at 2.5khz ensures that higher notes, particularly female vocals, can cut through the “veil” created by the lower midrange. Depending on recordings and your preference, this colouring can be pleasant or annoying. For me, I enjoy this tuning on some pop music, such as Ed Sheeran. It also works with some electronic music and classical recordings featuring cellos. However, I think the presentation is rather imbalanced and reduce the authenticity of piano and large orchestral recordings with multiple instruments.

Moving up the frequency range, we can find a valley at 6kHz where the MEMS driver takes over from the DD. Whilst the treble frequencies look rather unpleasant on the frequency response graph, they are surprisingly less offensive in real world listening. Yes, you can hear certain gaps in the treble, making some parts of high pitched instruments more prominent whilst others are a bit subdued. The imbalance between various frequencies making up the treble response also makes the timbre of Xeno suffer with some tracks. However, there are also positive aspects, such as a lack of the usual 5-6kHz harshness due to the dip in this region. The way you fit Xeno in your ear canal would play a significant role in how you perceive the treble. Another advantage is the sheer quality and resolution of the treble region, which brings about many advantages in terms of “technical performance”, which we will discuss further in the following sections.
Where do the tonality of Xeno fits in the grand scheme? To me, the stock tuning, whilst being rather pleasant and interesting, lacks certain refinement due to the uneven treble response. The V-shape colouring of the midrange also negatively impacts some recordings where accuracy is required. In summary, I consider tonality 3/5 (Good). At the end of the day, it does not really matter given how EQ is so seamless and integrated part of the experience with Xeno.
Bass and perceived dynamic:
Another area where Xeno eschews the modern tuning is the bass response. When most IEMs focus on sub-bass region and ignore the mid-bass, Xeno does the opposite. I presure that this is a necessary trade-off, as full range DD generally does not do subbass well compared to, say, the DD subwoofer used in the flagship HiBy Zeta. Still, the mid-bass focus response does have a few advantages, which are intensified by the nice quality of the 10mm graphene DD.

The first advantage is the overall sense of precision and incisiveness of bass attacks. Whilst Xeno does not have razor sharp bass transients like the modern Balanced Armature (BA) woofers implementation, Xeno’s bass still feels tight with minimal smearing. Moreover, the bass of Xeno also feels powerful and punchy, as if every kick, every pluck of the bass guitar has a weight behind it. Unlike sub-bass focused IEMs where kicks create a physical sensation deeper down in my throat, the physical punch of Xeno feels more like air being pushed against my ear drums. Beside power, Xeno also does a great job at revealing details and textures of the bass line, which are particularly audible with bass guitars and acoustic basses.
Regarding dynamic, I find Xeno to be quite lively and can convey dynamic swings such as the crescendo at 01:10 in A Reckoning in Blood from The Ghost of Tsushima OST. Interestingly, the bass quality of Xeno remains consistent across EQ profiles. Speaking of EQ, the Xeno’s DD can some boosting, but I found that the best strategy is to lean onto the mid-bass centric nature of the driver rather than trying to push the sub-bass up.
In summary, even though the bass of Xeno does not offer as much sub-bass rumble as average IEMs in 2024, Xeno still manages to offer a nice bass experience thanks to the punchy, dynamic, and surprisingly textured bass. 3/5 - Great.
Resolution: To me, “resolution” can be broken down into three components: (1) Sharpness, incisiveness, or “definition” of note attacks (see the figure above). (2) The separation of instruments and vocals, especially when they overlap on the soundstage. (3) The texture and details in the decay side of the notes. The first two give music clarity and make it easy to track individual elements of a mix. The last provides music details and nuances.

Resolution is where the MEMS drivers flex their capability. I’m not talking about the “fake” resolution achieved by adding treble peaks to artificially sharpen the notes (though the stock tuning of Xeno certainly does have quite a few peaks), a trick commonly found in lower-end DD and some full-range planar IEMs. The problem with this “fake” resolution is that it falls apart the moment music gets busy with overlapping elements or when you actually pay attention more than cursory listening. No, I’m talking about the true ability of an IEM to incisively start the note where it starts and end where it ends.
“Precise” would be the most suitable adjective to describe the presentation of Xeno, particularly the way it handles the treble region. Musical notes, especially higher ones in upper midrange and treble region, feel crisp and clear. At the same time, the decay ends of the note is quite rich in detail. Sparse recordings such as Ciaccona from Bach’s Violin Partita No. 2 in D Minor, performed by Kavakos is where the MEMS driver flexes these qualities. I quite enjoy micro details such as the bow catching the strings. I am also impressed by the quality and nuances of the reverberation and decays of the violin in the recording hall. It’s hard to really convey by words, but the treble response of these MEMS drivers feel effortless and clear with minimal smearing, making them feels “fast”. In fact, I found that the incisiveness of trebleof Xeno is very close to, if not slightly better than, my current benchmark, the AFUL Cantor (5/5 in resolution), in back to back A/B tests. In terms of detail retrieval, Xeno starts to fall behind due to both the uneven treble which maskes some details and perhaps also due to the less resolving nature of the full range DD.

The full range DD of Xeno is, surprisingly, quite competitive against some “mid-fi” IEMs with multi-BA set up. For instance, when I listen to the “controlled chaos” ABC feat. Sophia Black by Polyphia, I find that Xeno does a nice job at separating elements of this busy track, making it rather easy for me to track individual elements. Whilst Xeno does not achieve the same effortlessness of Cantor, I found that it does a better job than my venerable Moondrop Blessing 2 (3/5 in resolution) in back to back A/B tests.
In summary, I found the MEMS driver in Xeno quite impressive when it comes to treble quality, but it is held back by the uneven frequency response and the good-but-not-spectacular full range DD. When these kinks are ironed out, MEMS-based IEMs could present a big leap in technical performance over the IEMs performance we know today. 4/5 - Great.
Stereo imaging and soundstage: Stereo imaging or “soundstage” is a psychoacoustic illusion that different recording elements appear at various locations inside and around your head. Your brain creates based on the cues in the recording, which are enhanced or diminushed by your IEMs, your DAC, and your amplifier. In rare cases, with some specific songs, some IEMs can trick you into thinking that the sound comes from the environment (a.k.a., “holographic”)

Another area where MEMS driver excel is stereo imaging. Simply put, they are spectacularly precise in how they place sound elements within the virtual soundstage, be it left-to-right or near-to-far or low-to-high. For example, when I listen to Original Sound Effect Track - Memory from Gundam Seed Destiny OST album, a compilation of all sound effects used in the show arranged in an atmospheric and immersive way, Xeno makes me feel like I sit in the middle of a busy battleship preparing to enter the battle, with sound effects popping everywhere inside and around my head with a 3D feel to the presentation. The sense of distance is also properly conveyed in tracks such as Shadow of Baar Dau, creating a spacious and immersive experience. These qualities also translate to excellent localisation ability in FPS gaming. For example, when I listen to my usual CS:GO recording for testing IEMs, I found that I can pin point both the local and distance of the sound in all direction with a precision level that is rarely achieved by traditional IEMs. 5/5 - Outstanding.
Conclusions
In many ways, Xeno is a first gen product, and with it all the pros and cons commonly associated with a first gen product. For instance, the integration between MEMS and other kinds of drivers still needs more refinement. Perhaps the tuning of the MEMS drivers themselves need further refinement so that the treble becomes more even to minimise masking and prevent imbalances that negative impact the timbre naturalness. At the same time, what has been achieved with Xeno is quite impressive and most of the downsides can be mitigated with some effort thanks to the included PEQ ability.Who should get Xeno? Whilst HiBy pitches the IEM as a product for casual listeners, I think the most suitable users of Xeno are hardcore IEM fans, especially those who like to tweak and customise IEMs. With Xeno, you have a superb foundation, thanks to the MEMS driver, to tune that dream IEMs that you have been imaging but lacking the clout to make a collaboration IEM with a manufacturer.
What I like about this IEM:
- Impressive treble precision and imaging of MEMS driver
- The ability to retune the IEM with a PEQ profile
- Thumpy bass response
- Quite difficult to fit due to the short nozzles
- Treble is uneven, making EQ quite challenging
- Sub-bass roll off
- The stock tuning is rather old-school
Bias Score: 4/5 - I like this IEM

Updated: October 5, 2024

magnificientako
Thanks for the review. Where did you get the hiby xeno firmware version 0.11? I have version 0.8.

o0genesis0o
@magnificientako hey mate. Thanks for reading
All of my firmware comes from HiBy via google drive, thus likely beta or preproduction firmware. If the firmware update app does not pick up new official firmware beyond 0.8, it’s probably fine.
