I am excited to introduce you to a fairly new brand. Recently, I came across Kaiser Atelier. You may think you don’t know this brand, but do you really not?
When I received a private message on 小红书, I had no idea who this company might be. But the name Kaiser is very familiar in the IEM scene. When they told me that they used to be an OEM manufacturer, I guessed correctly: Kaiser was associated with the Noble Audio brand, including their most iconic IEM, the Kaiser.
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Introduction
The Heir to the King… Was a Wizard?
Let me take you way back to the 2010s. In the first half, there was a Chinese brand named Heir Audio with the slogan “fit for a king” that specialized in premium universal and custom-fit monitors. I remember them dearly, as I was also entering the high-end IEM market with my endeavours at Rhines Customs at the time. Heir was very popular and ranked highly among audiophiles’ tier lists for at least half a decade. But things slowed down when John Moulton, aka “The Wizard”, moved on to found the American company Noble Audio with his brother. At Heir Audio, the Wizard worked together with “The Kaiser”, who then also continued to be an important China-based business partner for Noble.
According to the Kaiser, every CIEM Wizard Design model produced during the partnership was designed and manufactured by his team. While the Wizard handled branding and international business, the Kaiser was responsible for the acoustic engineering, industrial design, manufacturing, and CIEM production.
This cooperation seemed to last until COVID became an international threat in 2020. The Kaiser does not claim to be involved with Noble since then, and it could also explain the shift in Noble’s target market – now including TWS and Bluetooth headphones. Instead, the Kaiser used the time to focus on R&D and search solutions for problems that have always bothered him with custom IEMs.
While I cannot verify any of this, I do remember that when I listened to the Agis II (my favorite Noble IEM yet) at CanJam Shanghai in 2025 and asked John (the Wizard) about the configuration, he couldn’t remember and passed the question on to one of his family members – something that surprised me and which I had not expected from anyone involved with the product. Suddenly it’s starting to make sense.
In 2024, the Kaiser reemerged with his new company, Kaiser Atelier, and is now making waves in the Chinese high-end IEM scene. The market re-entry was introduced with a model called 惊碳 Marvicon, a CIEM design with the housing made entirely from carbon fibre for greatly improved rigidity, durability, and reduced resonances. Its visual appearance… worthy of a Wizard. I am reviewing the second model 臻碳 Zencarb, a US$3,000 high-end CIEM which brings a handful of new improvements – and even more, a whole new engineering philosophy! The list of features is truly inspiring and deserves a closer look.
For now, there is no company website, but you can follow the official @KAISER工坊 social media account on 小红书.
The Zencarb: “Ultimate Carbon”
While the English product name is officially called Zencarb, the Pinyin spelling of the Chinese name of the product 臻碳 is actually Zhēn Tàn. There is no easy or direct translation, as Chinese can sometimes be very poetic and ambiguous. A closer translation could be “Refined Carbon” or “Ultimate Carbon”, suggesting that carbon fiber is central to both the aesthetics and branding of the product.
The Case for Carbon Fiber
As was the case with the Marvicon, the main body is made entirely from carbon fibre, a feat near impossible just a few years ago. 3D printing carbon fiber is notoriously difficult because of the fibers’ tendency to warp during curing. The fact that Kaiser has achieved this at a production scale is a testament to their OEM background. The Zencarb could be the first major showing of the recent technical improvements. There are two main advantages that come with this. First, the physical durability is massively improved over 3D printed acrylic or resin. Second, the materials stiffness reduces resonances from the shell, potentially reducing resonances.
Customs with Ear Tips
While the marketing emphasizes carbon, the real genius of Zencarb’s manufacturing is its hybrid design. Unlike the first model, the second release shows a true innovation regarding comfort! The custom-fit design is actually manufactured in two parts, where the tip is made of silicone. Silicone has been used for CIEM for a long while because of greater comfort, but it was always a niche option because of inferior durability, difficult to manage for refits, and then eventually disappeared when 3D printing took over. It is great to see this return on the Zencarb as it noticeably improves the comfort in the ear canal. This also means that you only need to replace the tip when the silicone wears off after years. Another consideration is that the nozzle is designed to be especially wide to easily remove cerumen.
A Zen Approach to Engineering
Whether intentional or not, the English spelling “ZenCarb” evokes a fitting parallel. Kaiser’s engineering philosophy resembles the minimalist thinking often associated with Zen – not because it strives for simplicity at all costs, but because every remaining element is expected to justify its existence. Kaiser calls it “subtractive tuning”: the sound components are reduced to essentials, claiming that every further component is a potential source of degradation.
It is basically the opposite approach to many modern companies that engineer their products around hitting a target SPL response as close as possible. In the process, many add drivers, complex crossovers with PCBs, special tubing, additional filters, or even build acoustic chambers around the source components to fine-tune the sound.
But there is a saying that goes, “A master carpenter may own fewer tools than a beginner because every remaining tool has earned its place.” And Kaiser’s approach to signal path reduction is a very “Zen” state of mind.
While several aspects are unique to this product, others are comparable to various IEMs. The 4-way driver configuration consists of 2x DD for lows, 2x BA for mids, 2x BA for high mids, and 4x EST for highs. At first glance, ten drivers per side seems at odds with the philosophy of “subtractive tuning.” On closer inspection, however, Kaiser isn’t advocating minimalism for its own sake. His focus is on reducing unnecessary interfaces between the drivers and the listener, even if achieving his desired performance still requires a complex driver array.
A review in two parts: Before discussing the sound, it’s worth understanding the engineering. Many of the Zencarb’s most interesting ideas have little to do with frequency response and everything to do with how a CIEM is built. That makes this review easier to approach in two parts.
Part One: Reinventing Customs
Custom IEMs have always excelled at isolation, yet comfort has remained a compromise. Human ear canals deform every time we speak, smile, yawn, or swallow. A rigid acrylic shell cannot adapt to those movements. Kaiser Atelier’s split construction asks a deceptively simple question: What if only the part that actually needs to flex… flexes?
I have a fair bit of experience with CIEMs and put the Zencarb to the test.
Ordering a Truly Custom Piece
Kaiser Atelier is a company built around custom IEMs. Not universal-fit IEMs, but genuinely custom-made earpieces, individually shaped for each customer. This can have advantages and disadvantages. Discussing these deserves a whole article on its own. As I mentioned earlier, I expect the really interested reader to be already informed about CIEM.
Ear impressions are a requirement.
Needless to say, a custom fit is only possible when Kaiser Atelier is familiar with your unique anatomy. You can get your ear impressions taken by the Kaiser himself if you are lucky to meet him at an exhibition; otherwise, it is possible to ask an audiologist for assistance.
In my case, I have to thank FATfreq and especially Yeo, my dear international CanJam brother, who has taken my impressions previously “just in case” and provided me with the actual 3D scans as STL files. Kaiser had no issues using them. (Visit FATfreq’s official website – (Custom) IEMs made in Singapore.)
For stage musicians, it is common to use a bite block when taking ear impressions – to keep the mouth open and the ear canal wide while the substance hardens. This will ensure that the seal won’t break with jaw movement. However, keeping your jaw relaxed and closed will result in a more comfortable fit and is the default suggestion by Kaiser too. Being primarily a service provider for stage musicians, my impressions by FatFreq were done with a bite block, but I was sure to inform Kaiser about it and also sent a photo of how they were taken.
Availability
At point of writing, Kaiser Atelier is only available to local customers in China – with orders preferably coming through Taobao or T-Mall. However, some distributors in East Asia have already been found and might be listing the products when this article is published. There are no Western sales channels open as of yet. For the impatient, adventurous Western reader: you can try using one of the many Taobao agents that will place the order for you, carefully check the goods in a warehouse, and then forward them to your private address. However, I have no experience with how they will manage it if you want to send actual ear impressions to Kaiser for scanning, discuss the design through a middleman, and then wait a couple of weeks until the goods are ready – let alone manage a potential refit.
At roughly US$3,000, I would personally much prefer a more celebratory purchasing experience, with direct contact with a sales representative, and maybe even a glass of Champagne on the pick-up day. For now, at least, you will have to pour it yourself.
This link will take you to the Chinese listing (you need to be registered for Taobao).
Lead Time
After payment, Kaiser Atelier will test your patience. At the time of writing, they communicate a turnaround time of 45 days. My ‘order’ was received on June 21st, and on August 1st I woke up to beautiful images of my finished CIEM per direct messages (slightly sooner than expected).
Of course, international buyers then also need to somehow kill time before logistics are handled. In my case, I finally received them on the 14th. There were no hiccups or issues with the import process. In total, the whole process took a week less than 2 months. However, there was no middleman involved – this is probably „best case“. (Peanuts, compared to 24 months waiting time for a Rolex.)
Custom Designs
Having a custom-fit earphone is nice, but making it truly yours should also include a unique and personal design. While basic laser-engraving is included in the local price of 20,000 RMB, the truly mesmerizing designs are not. You can expect to pay around 5-10% extra if you want to make your fellow geeks really envious.
AFAIK, there is no design tool to help along the process, and communicating your vision and expectations will require good language skills (or AI tools). Of course you can browse images online and use them as a reference, but there is no discount on copying an existing design, just potential awkwardness if you should bump into your audiophile friend who carries the original.
As I received a review sample, I did not want to have any say in the design and let the Kaiser decide.
Design Highlights
My Zencarb boasts a mature aesthetic. Unlike all Zencarbs I had seen prior to my pair, this one’s carbon body sports a forged composite instead of woven fibre. The faceplate has additional gold flakes mixed into the chopped fibers. On top sits the brand’s “AK” logo as a silver metallic inlay. This might remind you of another IEM. The original Softears RSV (one of my all-time favorite earphones) has basically the same faceplate design, though the Zencarb’s chopped fibers are larger and the gold flakes have a warmer hue, which makes it look slightly more premium. Lasered onto the surface, which has a transparent acrylic coating, the right side is conveniently marked with the serial number, and the left side has Kaiser’s signature moved to the edge – each engraving is filled with silver color. This gives an additional layer that creates a fascinating depth when looking at the faceplate upfront. The relatively large serial number next to the humble logo makes the product’s technical aspect the actual artwork.
Kaiser Atelier includes several sets of silicone tips with different colors. The colors don’t seem to be the same for all customers but are chosen according to the design. My set includes gold, dark gold, red, and black. I have also seen blue and purple in other images. Especially customers who can’t differentiate left from right on their first CIEM can mix it up and easily identify the sides.
Comfort
All that beauty means nothing if the earphones don’t sit comfortably. I really don’t want to oversell it, but the Zencarb is by far the most comfortable (Custom) IEM I have ever tried out. There is no pressure either pushing against my ear canal nor pressure sensation at the eardrum. I am not sure if it’s because of the body’s large size, bass vents at the bottom of the shell, or if another mechanism is at play, but the Kaiser Atelier Zencarb causes zero ear fatigue. Yawning, chewing, talking, or lying down don’t make me notice any change in air pressure.
I observed that the silicone tips won’t easily stick to anything. There is also no friction with the skin at all. I have never experienced anything like it. The silicone tips just slide into my ears and create a perfect seal without me even noticing it. I really don’t mind tip-rolling on universal IEMs, but this experience is on another level.
However, the Zencarb is a chunky CIEM. It protrudes quite a bit. So its only limitation in terms of comfort is that I am not able to lie on the side with it unless I use a very soft pillow.
Isolation
To my surprise, the Zencarb isolates just as well as most fully sealed CIEMs. The dynamic drivers use a bass vent on the bottom side of the shell, but that doesn’t seem to hinder the passive isolation noticeably. Without scientific measurements, I would believe it isolates better than my 64 Audio A18t with m20 modules (which equates to more than 20dB).
Compared to Other Customs
I got my first pair of CIEM in 2013 from Rhines – which, btw, I loved so much that I started working for them. My Stage 3 still fits today, though I put on a lot of weight since (but my ears probably also grew bigger). However, pressure on the eardrum was just something that goes along with CIEM and takes some time getting used to. You can actually change the presentation immensely by purposely creating underpressure – the sound becomes louder and more direct. I remember sharing impressions with other users, and we weren’t quite sure which is the “correct” way to listen because of that. However, yawning would break that seal. This also meant that when using CIEM, I was still always adjusting the fit – just with universals too.
VS 64 Audio
This story continued with my 2nd, 3rd, and 4th CIEM until 64 Audio improved the comfort for me with the apex modules. However, 64 Audio is a pro-audio brand, and they build custom models for stage musicians. The finished CIEMs are very tight. Meanwhile, after putting on some weight over the past years, when I lie down on my back, the nozzle is fighting the change of anatomy. Since my A18t goes fairly deep, this is something that could cause pain over prolonged use.
VS Softears
On the other hand, my most recent CIEM is the Softears RS10. (And yes, the custom-fitted outperforms the universal.) This is such an ‘audiophile fit’ that it never causes pressure. The passive radiator also helps relieve stress on the eardrum – something that’s less noticeable on the universal but is a very welcome feature when custom-fitted! But on the other hand, the seal breaks easily, especially when lying on my back.
I have none of the above-mentioned issues with the Kaiser Atelier Zencarb. And that alone makes this a huge leap for CIEM!
Durability
As carbon fibre is the main theme, it is worth discussing what actually motivated the Kaiser to research this material for custom in-ears. As mentioned a few times already, carbon fiber is highly durable and can withstand a lot of pressure. If you think that doesn’t seem important for a luxurious ear piece that you will treat like a baby anyway, let me tell you a story. In 2019, I traveled to Tokyo. At the airport, waiting for check-in, my hand-luggage slipped off my main suitcase. I didn’t think much of it and continued to board the flight. In the cabin, when I was ready to listen to music, I opened up my IEM hard case and was shocked to the bone. My lovely customized qdc Gemini were broken. From a single drop. At waist height. In a case that was in a bag. I learned the hard way.
I am usually very, very careful with all my items. If it’s clothes, glasses, cameras, smartphones, or whatever, I try to avoid any signs of usage. And yet this happened to me. And I have seen how others handle IEMs. The threat of them breaking is real. And I am not even considering musicians that leave the stage full with adrenaline, ripping their CIEM out of their ears and throwing them into a corner.
Trying to break the carbon shell
To really show off the material’s strength, Kaiser Atelier sent me an empty shell to convince myself. (I double-checked; it is also customized to my anatomy.) I have put it to the test, dropped it from my balcony (4th floor) onto the courtyard, and also hit it with my biggest book. There’s not even a dent on the shell. To me, that really gives me peace of mind. Still, I am not the one who will toss a US$3,000 IEM without further protection into a bag, but just knowing I can safely drop my hand luggage anytime is a huge bonus for me.
Woven Carbon vs Forged Carbon
I wasn’t aware that the Zencarb is available in different carbon composites, e.g., woven and forged. As mentioned in the Design section, my pair uses forged carbon.
Woven carbon offers excellent directional strength because its continuous fibers can be precisely oriented along the expected loads. Forged or chopped-fiber composites sacrifice some of that directional optimization in exchange for greater freedom in shaping and more multidirectional reinforcement. For a small, highly irregular object such as a CIEM shell, that makes the latter particularly attractive. Ultimately, however, the exact mechanical properties depend on the composite and manufacturing process rather than simply on whether the carbon looks woven or forged.
Accessories
The included cable uses 6N single-crystal silver-plated copper conductors. If you are interested in where this lands on a rating scale, check out my extensive 2026 Cable Upgrade Guide. This is a very good high-end cable with a smooth and flexible dielectric. The transparent sheathing shows the silver-plating nicely. Connection, termination, and Y-split are customized and branded. I see absolutely no reason to invest in another cable.
If there’s one aspect that left me wanting a little more, it’s the case. It uses genuine leather on the outside and soft lining on the inside. But I can tell it’s a repurposed jewelry box. The inside mirror is covered with a carbon inlay and logo cut-out. The golden zippers don’t run smoothly, and the separate compartment (with hooks for rings) on the bottom creates bulk. The idea is probably to put the spare tips, filters, and cleaning tool and cloth there. Unexpectedly, the blue-tinted green color matches my iBasso leather case, but generally it’s not a good fit for my CIEM. I think this is a missed chance for a unique, unbreakable, and compact carbon fibre travel case. Ballistic nylon would also pair nicely. Here’s hoping Kaiser Atelier will offer unique travel cases from carbon or collaborate with VanNuys in the future. I personally would be willing to pay a surcharge for the option.
The earphones, leather case, and other accessories are actually all placed inside a larger heavy-duty chest that is presumably water-proof. It has shock-absorbing foam on the inside and foam cut-outs for all the various components. It’s surprisingly lightweight, though quite large to actually take along.
Short Recap
The Zencarb is an expertly crafted high-end IEM, but its real achievement isn’t the carbon fiber itself. It is the way Kaiser Atelier separates the jobs of structure and comfort: a rigid shell protects the expensive electronics, while a soft custom interface adapts to the ear. In my experience, that makes it not only exceptionally durable, but also the most comfortable CIEM I have ever used – custom-fitted or not. Those features alone are so inviting to not only carry the Zencarb with you at all times, but also to use them every chance you get.
I just managed to write over 3,500 words about an IEM without telling you how it sounds. Let’s talk about that in Part Two.
Part Two: When Less Is More
Before I give you a conclusive sound description, let me start by highlighting Kaiser Atelier’s tuning philosophy. Because, based on my experience, this is worth covering on its own. Usually, most IEM designers have an idea of what sound they want to achieve. Approaching the vision often goes like this: “I think it needs a few dB more here, a little less presence in this area… let’s try shifting the crossover, exchange a driver that excels at another frequency range.” The more granular the adjustments get, the more complex the configuration becomes. They are designed by addition – complex arrays with multiple interfaces like PCBs, special tubing, filters, and acoustic chambers. The Kaiser argues that this approach obstructs the signal path and creates a disconnection from the music. His solution is nicely represented by a quote from Antoine de Saint-Exupéry: “Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” Kaiser calls it “subtractive tuning”: reducing components in the signal path to essentials, claiming that every further component is a potential source of degradation.
I wouldn’t have bored you with the preceding paragraph if there were no possible truth to it. Because Kaiser Atelier’s “subtractive tuning” is very effective based on what I hear. The Zencarb sounds direct, unfiltered, life-sized, and realistic in a unique way that I haven’t experienced before. That’s not saying that ten drivers per side in a 4-way crossover is a reduction to minimalism, but the sound at my eardrum gives a sense of musical involvement that I am not hearing with similar driver compositions.
With the Zencarb, there is less between me and the music.
Reading the Blueprint
Measuring the Zencarb proved to be a challenge. I use a plastic mold to imitate my ear canal, but the silicone tips won’t stick at all. Additionally, I have lost a few parts of my IEC 60318-4 that I used to measure my CIEM previously. For full transparency, I am posting my results anyway since their characteristics are broadly relatable to my hearing impressions. I am also sharing the manufacturer’s graph for comparison.
The Zencarb uses two dynamic drivers for the lows, and both seem to be focused on the sub-bass. The low-end emphasis is limited to frequencies below 150 Hz. This is not a bassy IEM but one that creates a lot of weight, depth, and atmosphere.
The midrange has warmth, richness, and a bias towards fundamentals. There is no mud or bass bleed, but a delicate plateau from roughly 200 to 500 Hz of +2 dB. The vocal presence region is more relaxed than Harman, JM-1, or sloped diffuse-field targets typically suggest, yet a gentle and narrow rise between 4–5 kHz preserves articulation and texture. The timbre of instruments and vocals sounds convincing and natural.
The treble section has no audible peaks, but it is noticeably recessed by a couple of dB compared to the midrange. That gives it softness without coloring the timbre. It also helps when increasing the volume – the Zencarb never sounds like it is too loud.
The Listening Experience
I feared I would never finish this review because every record I started playing pulled me in and captured me in its own world. The Zencarb reveals amazing nuances but always prioritizes emotion.
Based on my preferences, I did not expect to love the Zencarb as much as I do.
After using it daily for a while, I describe its sound as having a deeply immersive, warm-leaning presentation with exceptional sub-bass extension. It has unusually high resolution without any treble aggression, and boasts a large, enveloping soundstage. Yet its greatest strength is not how much information it reveals, but how effortlessly it allows that information to become music.
A bass that builds worlds
Zencarb’s low-end is exceptional and possibly the most addicting and fun bass I have yet heard. Its slight elevation focuses on the sub-bass, which creates depth and immersion. While the low-end is definitely predominant, it’s not adding a thick blanket over the music; it’s creating a foundation underneath it. Effectively, I would not describe it as punchy, nor boomy, but atmospheric.
The Zencarb is not all about the bass, yet its low-end reproduction is possibly what makes it sound most interesting. It manages to make every production stand out in a unique way. Take Miley Cyrus’ Plastic Hearts, for example: the reverb in the bass is the driving force, with great bounce that forces toe-tapping participation. Moving on to Billie Eilish’s Don’t Smile at Me, the sub-bass is essential for the atmosphere, and the Zencarb creates an enveloping presence that swallows the listener. Very rarely have I felt that the low-end is too dominant. One example would be Katie Melua’s Call Off the Search. However, this is a rare occurrence, and the same songs sound cleaner and better balanced on the Live at Royal Albert Hall album.
The low-end presence works especially well with older recordings like Madonna’s Like a Prayer (Japanese pressing) that I have often experienced as sounding bright, flat, and boring. Fortunately, this is not the case with the Zencarb, which gives it more richness, dynamics, and ultimately a lifelike presentation.
The Zencarb really spoiled me with tracks that use the lows to set the mood. On BFG Division from DOOM’s OST, the bass creates shockwaves that can be physically felt. Or when the drums kick in for the first time on Tool’s Fear Inoculum, the sub-bass impact reminds me of the T-Rex encounter in Jurassic Park. Though I have felt the bass most prominently on Nine Inch Noize by Boys Noize. It can be absolutely earth-shattering when called for.
Separation without disconnection
In my evaluations, I give most weight to the midrange. And the Zencarb manages to also impress me in this frequency range. The resolution is definitely worthy of a flagship tier, as it is easy to identify production methods like doubled voices, Auto-Tune, etc.
The Zencarb is not a technically sounding IEM, though its strengths rely on it. Based on the tuning, I expected the violin on Quatuor Modigliani’s Haydn – Bartók – Mozart to take a back seat compared to the cello, but that is not the case. The violin receives all the focus it demands with superb texture and detail. This is an especially harmonic-sounding recording, and the Zencarb treats the music always as a whole.
Taking the aforementioned record by Billie Eilish, the Zencarb lays all vocal tracks bare and delivers details galore. It functions as an X-ray into the production process. This is also a great example to transition into the next section. Because none of the details are distracting or sound technical – I consistently feel overwhelmed by the melodies.
Resolution without aggression
Going back to DOOM’s OST, I like to use Rip & Tear as a test track because there is so much going on that it resembles pink noise. While all layers come through nicely and no information is lost – despite the thunderous presentation – the sound is dark and gritty but not fatiguing. The verdict is similar with trumpets on Jazz recordings like Chris Potter’s multi-faceted The Dreamer Is the Dream or Ketil Bjørnstad’s La Notte. Not rarely would the trumpets stress me – though rich in texture, they sound fairly smooth on the Zencarb.
The 2LP Souvenance by Anouar Brahem is dramatic and captivating, with shimmers of hope enveloped in a constant threat. The tracks are dynamic in pacing and storytelling. The few repetitive themes create the only safe space for the listener. Though the recording is minimalistic in parts, with the Zencarb it sounds so much grander and more complex than the number of layers should allow. The CIEM separates the layers when multiple things are going on, but also treats them as a harmonic unit when the forces come together.
An enveloping soundstage
While I already mentioned how the bass can be enveloping in presence, it’s only half the story. The soundstage can expand exceptionally wide and deep. When distracted from the music, this is still an in-your-ears sound. But once I focus on nothing else, the Zencarb pulls me into an alternative world. As a listener, I then don’t feel like I am overseeing the music from afar, nor do I have the sense of sitting in the first row. I actually feel surrounded by it, with decent space and sources scaled to life-size.
Nesrine’s Kan Ya Makan (Once Upon a Time) is a stereo record, though the background vocals surround me as if the album was playing in Atmos. I had the same impression when playing Anxiety by Doechii. Yet the surrounding soundscape is not exclusive to vocals. An even more impressive example is Noisia’s Outer Edges. As a listener, I feel like I am swimming in the open sea, and Noisia controls the waves. They pull me in, push me down, move me left and right. I lost control; I got lost in the sound sphere. I consider the soundstage of Kaiser’s Zencarb not merely as wide or deep but truly three-dimensional as far as I have experienced with IEMs.
When technical performance becomes emotion
While I am deeply impressed by the technical performance, it’s actually emotion that comes to my mind first when thinking about the Kaiser Atelier Zencarb.
As cheesy as it sounds, the Zencarb is an IEM that I feel really drawn to when I just want to enjoy music – of any kind!
The aforementioned Kan Ya Makan has moments that are defined by a depressing tone. The emotion comes through every time. Maybe it’s not about neutrality; maybe it’s this that the artists intended. I could certainly understand why. Switching to Lamb of God’s self-titled album, the lower midrange brings out the power in the growls that contrast the crunch in the guitar riffs. While the cymbals splash in the background, everything harmonizes and creates a complete whole. The intensity can be felt and transfers the energy to the listener. At this point, it’s worth highlighting that I really enjoyed increasing the volume when using the Zencarb. It handles loudness really well. It sounds precise and clean even above my volume tolerance.
“Do you wanna bang heads with me?” asks Danzig on Mother. And my reply using the Zencarb is a resolute “oh hell yeah!” Kaiser Atelier is demanding my full attention and hands me the air guitar. With closed eyes, I believe I am on the stage myself, surrounded by the band members. Time flies; 3 hours later it’s 1 am and I make a grave mistake. I should not have hit play on another record… I just could not interrupt Tool’s 80-minute adventure on Fear Inoculum,and I blame the Zencarb for it. And these are not cherry-picked examples. I have experienced the same multiple times during the testing period.
I cannot confidently say whether it’s because of the tuning or Kaiser’s engineering philosophy of minimizing the signal path – very probably it’s both together – but
the acoustic picture painted by the Zencarb is more dense than I have ever experienced. In a way, the music has more presence. The most suitable term I can think of is ‘saturation’, and in this regard, the Kaiser set a new bar for me.
In Context / Comparisons
Sticking with the tribrid driver configuration of DD, BA and EST, I did A/B sound comparisons with several flagship contenders:
- Kaiser Atelier Zencarb (2xDD + 2xBA + 2xBA + 4xEST)
- Softears Enigma (2xDD + 2xBA + 4xBA + 4xEST)
- Softears Cerberus (1xDD + 4xBA + 2xEST)
- Grand Oriveti Supremacy (1xDD + 4xBA + 4xEST)
However, the direct comparison with my trusted 5-way 10xBA reference, the Softears RS10 (custom-fitted), turns out to be potentially the most interesting.
Versus Softears RS10: The Reference Challenge
I think comparing the Softears RS10 to the Kaiser Atelier Zencarb is particularly revealing. The RS10 is my daily reference and unbeaten flagship since 2021. When I started this review, I was using the CIEM version, though I wasn’t able to take a photo of the two next to each other. Unfortunately, I got robbed recently, and the most valuable item in my bag was the RS10… Going back to the universal-fit, I notice how the CIEM had a stronger sub-bass presence and the treble was better balanced. The universal sounds drier and flatter, though also impressively neutral.
The Softears RS10 sounds extremely uncolored and resolving to me. Using it, I am sure to catch every little detail, as well as the atmosphere. It’s a tool that tells me how good the recording was, how it got produced, and what the mastering engineer’s intent was. All of that without even sounding slightly fatiguing! In its own category, the RS10 is perfect. (Which makes me very nervous about the upcoming RS10-II.) After I discovered it in 2021, I have rarely been impressed by other IEMs.
This is very unlike the Kaiser Atelier Zencarb. Even if both have the same intention, they couldn’t be more different in their approach. With the RS10, I feel like I am sitting at the mixing desk and can oversee everything. But instead of banging my head, tapping my toe, or playing the air guitar, I am pointing fingers left and right and moving my eyes according to the music. With the Zencarb, I am climbing on stage and jamming with the musicians. Which is the greater feat? I honestly can’t tell.
Recently I wrote an editorial and asked how many IEMs we need. I concluded that to truly experience the engineer’s intent, using multiple IEMs is at and advantage. This is definitely the case when comparing RS10 with Zencarb: both are transparent in their own right.
Versus DD+BA+EST Tribrids
All tribrids in the pool are technically very capable. Yet the four IEMs, which on paper have obvious similarities, have different styles of presentation that also handle resolution differently.
The Cerberus has the darkest treble of the bunch. I would argue that – in this comparison – it’s the only IEM where a recessed treble sometimes bothers me. I feel like sometimes information remains hidden. It does make up for it in the midrange, though.
On the other hand, the Enigma sounds possibly technically most capable. This is an IEM that puts technical prowess to the front. Somewhere I wrote that it’s “the warm high-end tribrid that Cerberus wants to be”. (Though I guess that is not true; Cerberus wants to be unique.) Bass texture, midrange detail, and treble information all exceed the amount of which my mind expects of an IEM. Depending on my mood, this is either the most explosive hifi “wow” sound, or a bit too technical sounding that leaves me wanting more musicality.
The Supremacy is dialed down compared to the Enigma, which makes it more capable as an allrounder. I also find the timbre to be superior to all the other tribrids, including the Zencarb. In terms of details, Supremacy is possibly the least revealing despite having a more forward treble than the others. It can sound sharper (not sibilant), but not in a way that separation, layering, or detailing outperform the others. While the Grand Oriveti Supremacy is my personal preference over the other two, it doesn’t have the atmosphere, saturation, or depth of the Zencarb.
The Zencarb isn’t necessarily revealing more information. It presents information differently. Everything feels closer and more direct, but nothing is shoved into the listener’s face. The details are there, but they don’t demand attention. I have a sense that the texture quality is used to create realism.
Bass
I think it’s fascinating how different the low-end of all of the featured IEMs sounds. Starting with the Cerberus again, I have to admit that I love its bass. The curve is fairly flat with a slight rise towards the sub-bass. It has great monitoring capabilities but sounds wetter than a studio tool. It doesn’t draw attention but gives me all the information I need. I don’t ask myself whether the Cerberus sounds boomy, punchy, or rumbly, but if the record does.
The Enigma has the strongest low-end in terms of quantity. However, due to its strong harmonic tuning, it can manage to disappear when a lot is happening in a track. When a track wants to be impactful, though, the Enigma can be overpowering. Most of the time, it provides insane texture details and should satisfy users who especially like to listen to strings.
The Supremacy falls in between the two in terms of quantity and quality. Again, I would say that this matches my personal preference most. It has a similar character to the Enigma but with the politeness of the Cerberus.
The Zencarb is the only IEM with a bass shelf in this shootout, and that makes it stand out immediately. Compared to the Supremacy, the Zencarb is bolder and “goes all the way” in terms of sub-bass presence. Again, this is not a bassy IEM in regards to boom or punch, but it has the strongest physical presence out of all the mentioned IEMs.
Spatial presentation
The Cerberus has a mid-centric tuning despite its warmth. This gives me the impression that all of the midrange instruments and voices are fighting for attention. Ultimately, the soundstage sounds relatively congested.
Enigma also sounds relatively compact to my ears. The big low-end sometimes presses against the mids, which leaves vocals less air to breathe. I have read user impressions that claim Enigma’s soundstage to be huge, but that’s honestly not my experience.
And yet again, I prefer Supremacy’s presentation. It gives me the “front row” experience with romantic intimacy. It spans nicely in width and depth.
However, the Zencarb is hands down the most impressive. Its previously described quality of enveloping the listener completely creates an experience that doesn’t feel like the music is playing in front of me, but that it surrounds me. It’s the IEM that best deserves the description of sounding holographic. But please note that the Zencarb has an unfair advantage because it is a custom-fitted IEM. (Cerberus and Enigma are also available as CIEMs, by the way.)
Emotional engagement
This section is arguably the most subjective, but based on my previous notes, I hope they are relatable. Cerberus is a great fit for moments when you’re particularly searching for intimacy. Take a minimalistic vocal Jazz record, and the experience is hard to beat.
For me, the Enigma is foremost for technical performance. It’s not inviting me for a romantic or even musical experience, but it gets decent playtime in short bursts for when I want to bleed my mind dry. It’s usually not my first pick, but I am always curious to hear how the Enigma dissects a record that I just listened to.
The Supremacy won my heart in that it is one of the most musical sounding IEMs in my collection. As soon as I wear it, I don’t even have to think about it at all. It just disappears. I don’t care about resolution, soundstage, or tuning – it’s all exactly how I want it to be, and that makes it transparent to me. Music first.
The Zencarb takes Supremacy’s experience one step further. “What’s a step above transparency?” you might ask. Let me tell you: It’s when the music stretches out its arm, grabs you by the throat, and demands that you stop whatever you were doing. It forces you to take the air guitar, lose yourself, and forget time.
Verdict
Seriously, I haven’t been as impressed with an IEM since 2021. The Kaiser Atelier Zencarb is a true innovation in CIEM manufacturing, and it is hands down the most comfortable IEM in my collection – custom-fitted or not! The hybrid build feels like a substantial break from conventional manufacturing, and I wouldn’t be surprised if this becomes the new premium standard in the future. Thanks to the carbon body, Kaiser Atelier also builds the most durable IEMs yet.
Of course, the great production (build, comfort, and aesthetics) is substantial to the positive overall experience. But even when focusing on the sound alone, the Zencarb performs at a flagship level. Its fatigue-free, warm, and natural tuning is inviting and captivating. The Zencarb manages to reduce whatever technical barrier is between the music and the listener. I have never felt closer to the music!
To me, the Kaiser Atelier Zencarb isn’t just a US$3,000 flagship IEM. It has set a new bar!
