TANCHJIM - Fission

Tanchjim Fission Use the included USB Dongle with the Modular Cable, with the Tanchjim App (Android Only), and that will give you access to their PEQ, and you can dial in as much or as little vocals as you want.

Tanchjim Fission would be a great option. It also has a USB DSP adapter for the cable, and you can adjust the EQ with the Tanchjim App (Android only). Lots of tunability with the Fission, and really good detail. Same driver as the Origin.

I'd say go with Tanchjim stuff — Nora, Fission, Bunny, Origin, Force... they all have a fairly neutral-ish tonality. In my opinion, they’re a safer recommendation than the Hexa. The Hexa is really divisive — people don’t seem to agree on how it sounds. Maybe it’s the odd hexagonal shell shape, but there’s a lot of variation in impressions. Nobody agrees on the sound. You got like 75% of people saying it has no bass and 25% saying it has the perfect amount of bass. Quite a number of people (myself included) just don’t like it. Go for Tanchjim instead. You really can’t go wrong with Fission. It's very very close to the Tanchjim Origin which is an awesome IEM.

DX1. Gives me Hexa vibes. It's just as soulless as the Hexa and with no toe-tapping but quite accurate. It's like the Hexa with a smidge more soundstage, just a smidge. I returned it that very day. Aside from that go for the Tanchjim Fission which is pretty much (apparently) the same as the Tanchjim Origin. I have the Origin and legitimately view it as an upgrade over the Hexa in every single way.

Hey y’all! The Tanchjim Origin is Tanchjim’s flagship single dynamic driver set, and Tanch is causing a bit of a reaction by taking its proprietary DMT-5 driver and putting it into the Fission, a new single dynamic driver set retailing for $129.99. That’s certainly a bold strategy, and we’re gonna see how it pays off. To top it off, the Fission comes with a few bells and whistles even the Origin can’t match. Tuning switches, swappable terminations, wtf? Please join me and my confused smile as I take a peak at Tanchjim’s attempt to split the atom. Many thanks to Tanchjim for the review copy. (Quick note, no vid on this one yet, been a little under the weather this week) # Look and Feel Upon opening the box, we’re greeted by a packet of goodies including some paperwork, two sets of silicone eartips (bass and treble), a soft pouch, and one of the greatest included accessories of all time: a tiny stainless steel screwdriver with “Tanchjim” proudly written on it’s side. Its a flathead, just like me! Might just put it on a chain and start rocking it around town. The Origin didn't come with a pendant! Digging deeper into the box we’ll find our champagne colored earphones sporting a glass inlay on the faceplate (I think the copy called it “mirrored sapphire”) and two extra interchangeable nozzles. The set comes with stainless steel nozzles attached to it, with brass and titanium nozzles affixed to a tiny aluminum stand. The earphones take on a familiar look and shape to others in the Tanchjim family like the Bunny and the 4U. The fit feels a lot like the Bunny’s to me, a very compact package. This should prove to make for an accessable fit, even for the smallest eared folks out there. Even more accessable than a certain other set. Arriving at the third and deepest layer of the box we’ll find our cable. And SURPRISE SURPRISE, I like it better than the Origin cable. The “long 2 pin” cable has a hearty double helix cable that seems to be braided in fabric and encased in plastic. I’ve always been a fan of that particular cable aesthetic so I was happy to see that here. Not only that, it has an interchangeable termination, including 3.5 single ended, 4.4 balanced, and USB-C options. Now it seems to to me the only accessory advantage the Origin really has here is the purse, er, pretty white case it comes with. Surely there must be an acoustic advantage. # Sound Inpressions From first listen, the similarities to the Origin were undeniable and I couldn’t keep from comparing the two in my head. That’s great news for anyone looking for a highly capable single dynamic driver set in this price range. Owning both the Bunny and the Origin, it was almost surreal to hear a sound so close to the Origin in what is essentially an aluminum Bunny shell with a switch. Speaking of switches, all of my sound impressions are taken in the sets stock position. Each of the other switches reduce the bass to some extent, and I preferred the balanced presentation of the stock setting. I felt the low end was well represented in the his position without detracting from the rest of the presentation or introducing any muddiness. The switch settings may be a boon for those that want a more treble or upper midrange centered set. The stock setting is the one that’s substantially similar to the sound signature of the Origin. Furthermore, I found the brass nozzles gave the set a slightly warmer sound, while the titanium nozzles made it a bit brighter. I found the differences subtle but certainly noticeable. I settled on the stock stainless steel for sound impressions, the most balanced of the three. **Bass** The Fission is honestly pretty close to my ideal sound signature, and all of the bass is in exactly the right place. Even on its bassiest setting, I wouldn't call the Fission a set for bassheads. The midbass has a quick, satisfing kick to complement the soft rumble of the subbass. The subtle accentuation of the midbass texture ensures an engaging and dynamic sound across various genres, making the set a great all-rounder. The stock setting has a natural-sounding low end that never detracts from the rest of the sonic presentation. Not does it get lost in the mix. The full and natural midbass does wonders to enhance the presence of male vocals, lending the midrange a little hand. **Mids** I feel like I'm writing my Origin review all over again to be honest. The midrange is warm and natural. It sounds organic, with exquisite detail for the price range. The resolution of the midrange really shines, resulting in a more emotionally engaging sound to many tracks. I wouldn't say this is a vocal forward set, but it can be depending on how the track is mixed. I’d say the midrange is perfectly in line with the bass and treble, with female vocals hovering just slightly above the sound of most tracks. Just like the Origin, the set strives for a realistic presentation that gives equal weight to all frequencies, as they would sound in nature. **Treble** Best single dynamic treble since, you guessed it, the Origin! The treble extends well into the highest frequencies without becoming fatiguing or uncomfortable to my ear. Its incisive and exacting, with a quick attack and natural decay. The treble is extremely well controlled, with no real sibilance to be found on any of the tracks I tested. No tuning quirks or dips here, just well tuned, extremely linear, neutral, textured treble. **Techs** Finally, a bit of a difference from the Origin. While the sound signatures of the two sets are very similar, the soundstage is a bit more spread out and open on the Origin than the Fission. The drivers in the Fission are fit into a smaller package and placed closer to the ear, the larger stainless steel body of the Origin sets them back a bit farther. Fission still has precise imaging and an organic tonality/timbre. Its transient response time far outpaces the majority of single dynamic driver IEMs I’ve tested. It’s big brother Origin wins out just slightly in its presentation with its ability to project that technical prowess across a wider stage. # Final Thoughts The Fission is an amazing value at $129.99. The Dunu Kima 2 is the closest competitor I can think of, but it’s tuned a touch brighter and doesn't come with all the extra touches the Fission does. (nozzles and switches and terminations, oh my!) Its technical performance rivals more expensive single dynamic driver IEMs like the Moondrop Kato and, of course, the Origin. It feels like the Fission is setting a new bar on what one can expect from a single dynamic driver set under $150, and ensuring the mid to high end of the market are going to have to innovate to stay competitive. I love that. Its the exact same thing they did to the super-budget market by releasing the Bunny for around $20. In short, I highly recommend. Tanchjim has successfully split the atom, and Fission has been achieved. I’m staring at the mushroom cloud now, but I’m not afraid. It looks like a bright future to me, I think I’m gonna grab some shades. Thanks for reading.

I just tried it, it seems like the profile saves to the termination. I set the EQ on my DAP and it played on my phone, same setting played back. Between the two, I prefer the Fission. Its more neutral with better treble extension, just more to my tuning preference. If I was a basshead, I’d go Quatio. Thank you bro, feeling better already thankfully.

I prefer fission, the new-meta tuning of the pure is just less compliant to my tuning preference. I like the excitement of a little upper mid spike I guess

Demoed Origin... yeah I'm sticking with the Fission. Not that much better and not very comfortable to me. They have outdone themselves lol.

# Review Of The Tanchjim Fission https://preview.redd.it/wflao90qho9f1.jpg?width=7902&format=pjpg&auto=webp&s=09c0811efaf3eb2c7db4e285d5b83ed0a88955de **Introduction** https://preview.redd.it/43seua6pho9f1.jpg?width=8064&format=pjpg&auto=webp&s=246e482b36c685188c46f560f7bc3b9f6ddc4fec It’s been over a month since I tried their ultra-budget offerings, Zero Ultima and Stargate II. I didn’t expect Tanchjim to be just warming up for another offering. As I mentioned before, Tanchjim is a well-established Chinese brand known for its IEMs. Nowadays, people have also started appreciating their DAC/AMP offerings. When I heard about this project, I was thrilled with what they were experimenting with. I assumed they were creating the most versatile set ever. And guess what? My guess is true. Tanchjim’s new offering, Fission, is their most versatile IEM in their catalog. Before proceeding further about Fission, I’d like to clarify a few points. **Disclaimer** \*Since this unit tour was organised by the kindly people at Tanchjim, I am grateful to them. As I've said in all of my evaluations, the same is true for this one: all of the concepts I've expressed below are entirely my own, original ideas that haven't been influenced by anyone else.  \*I am not associated with the connection, and I receive no financial assistance from anyone. \*For the remainder of the review, I will refer to these IEMs as “Fission.” \*I am using different ear-tips for convenience and better versatility. \*Finally, I will only evaluate the Fission based on its performance, even though I will explain how it feels and seems physically and aesthetically. \*My evaluation is based on the standard preset that was pre-applied to the IEM. I will discuss the other types of presents in a separate section of this review. \*Please understand that all opinions expressed in this review are my personal perspective and are not intended to offend anyone’s beliefs or experiences. Therefore, I kindly request a respectful and thoughtful approach to this review, even if it differs from your viewpoint. **Specification** https://preview.redd.it/5dgql9ymho9f1.jpg?width=8064&format=pjpg&auto=webp&s=9bf2758828299bd2e2d4b785f40df8695203be5d Fission, a single dynamic driver IEM, houses the latest 5th-generation DMT driver, which incorporates high-precision imported capacitors. Above the driver, a CNC-machined brass waveguide faceplate enhances the transfer of higher-frequency energy. The shells are crafted from lightweight aluminum alloy, adhering to the design of their previous IEMs, which, when assembled, resemble bunny heads. A rose gold accent (referred to as the Champagne color) adorns the shells, while the face cover is made of a plastic material that helped exude a sapphire mirror accent. Below the pastic glass cover, the brand name is engraved. The IEM exudes a premium feel despite its lightweight construction. As with their previous IEMs, I encountered no comfort or fit issues, although I used my own eartips to achieve the best seal and isolation, ultimately enabling me to listen to them for extended periods compared to other IEMs.  Now, the shells also feature the tuning knob technology that was also present in their IEM 4U, allowing users to choose from four different tuning options when dialed using a tool, these tunings are: Default/Stock, Pop, Natural and Monitor. Additionally, there are two other interchangeable nozzles also available. When considering all these factors, the total number of sound profiles to choose from is 12. The nozzles are equipped with a waterproof acoustic filter, which is actually DWR-coated, helping to keep dust and moisture out. The cable complements the IEMs beautifully. It’s silverish-white in color, while the connector, termination, Y-split, and chain sink are all in rose gold. The cable feels lightweight but is well-made and exudes premiumness. It’s made of litz copper and silver plated with a silver foil shield. It has a two-pin connection and offers a multi-termination option with three interchangeable options: 3.5mm, 4.4mm, and a Type-C DSP. However, the two-pin connector is reminiscent of the two-pin connector of the cable provided with Bunny. The two pins are longer than common two-pin cables. The DSP connector also supports app support, which provides four additional sound profiles: Popular, Balance, Musical, and Nature. It also has a Game EQ and custom EQ option. Users can share their custom EQs or try others using the app’s EQ forum. The accessories include six pairs of eartips in two different types and three different sizes, three interchangeable termination plugs (4.4mm, 3.5mm, Type-C), two interchangeable nozzles, a turning tool for the knob, and a carrying pouch. The technical specifications include an impedance of 16 Ohms and a sensitivity of 94dB. The frequency response is from 8Hz to 48kHz, and the total harmonic distortion is 0.056%. **Sound** https://preview.redd.it/eim5hrnkho9f1.jpg?width=4032&format=pjpg&auto=webp&s=8ea6d86cd87a1277ac80bf95f6a1c006b5d92456 The tuning of these headphones is quite similar to that of the Origin, which is tuned on the graph and uses the same drivers. However, I can’t quite determine whether the sound is different or similar to the Origin. This is because I’ve only tried the Origin twice, and I’ve found that Tachjim is the only brand that can fully bring out the potential of a single dynamic driver. The sound is coherent and natural, and it elevates the listening experience, drawing the listener deeper into the music. This is true for the fission as well, but I can’t quite say to what extent.  From a holistic perspective of the entire presentation of the sound of Fission, it appears to be relatively neutral with a strong emphasis on the midrange and a subtle emphasis on the bass. However, it enhances the vitality and pure essence of the music, allowing the listener to fully immerse themselves in it. Personally, I believe these are among the best-sounding IEMs in terms of vocals. The raw, unfiltered, and pure vocals capture the listener’s attention and deliver the full, authentic vocals with clarity and details. When it comes to instruments, I can almost say the same. However, the exact way sound is delivered can only be understood by learning how each section functions and produces its specific presence.  The treble region has a captivating and energetic quality that contributes to the delivery of the vocals and instruments. It ultimately results in a transparent and lively sound. The upper treble section has a smooth and airy quality that enhances the fullness of the vocals and instruments, creating a cohesive and smooth flow. The lower treble section adds energy and vividness, resulting in a lighter and more airy sound that draws the listener in with its transparency and clarity.  The midrange, as mentioned earlier, is exceptionally forward, allowing for a lively and vibrant sound from the vocals and instruments. The presence is so well-executed that the vocals and instruments are positioned harmoniously around the headspace, delivering a fresh and pure essence to the mix. This provocative approach never lets go of the listener’s attention and drawns more into a lucid dream. While these words may be superlative, they accurately reflect my experience over the past two weeks of using the Fission. However, there are certain aspects that I find less appealing compared to multi-driver IEMs. These aspects stem from the tuning process. While such a response is cleverly marketed as appealing, I prefer a more positioned and concert-like sound. The sound that I prefer is where every note is precisely positioned, and the dynamic quality of each note contributes to a spacious and expansive sound. This effect is not what the Fission delivers, though It reminds me of my love for the Simgot EA1000. The bass in the Fission is somewhat different from that of the Origin. While it maintains the same fluidity and control, it doesn’t leave any trace of sub-bass or mid-bass behind. It also doesn’t try to emphasize either of these frequencies, which allows for a consistent and natural tone. However, the Fission sounds a bit less weighty and more tactile, offering the same control and articulated bass response but lacking the full-bodiedness of the notes. There is also drastic reduction in bass emphasis which occurs when the knob is turned clockwise from the stock position to a full circle. The bass has good exposure of bass notes with detailed textures, but it lacks the sufficient heft and impact that is well-done in other sets around the same price range, whether planar or multi-driver. Regardless of the choice of IEM, the bass lacks the impact that is well-executed in other sets.  I am thoroughly impressed by the vocal delivery and how the entire presentation unfolds in a fresh and exciting manner. The drawn effect when listening to both the vocals and instruments, coupled with their well-separated yet cohesive and natural sound, makes me realize that this is a must-have for mid-centric tuning enthusiasts, particularly those who have a passion for vocals. **Vocals**  Like I’ve mentioned before, the vocals are a powerhouse, effortlessly delivered with brilliance and freshness. But what really matters is the specific sound. Some people prefer centered and less forward vocals that help pinpoint the notes, scale, or octave each part of the track is emphasizing and by how much. Others simply love how clearly and faithfully they are produced and grasping they can become. Take, for example, the Ziigaat Lush. The way the vocals and instruments were spread out and positioned made me feel like each note sounded spacious and distinct. But for Fission, it’s different because of how they’re delivered. When I listened to Akuma no Ko by Ai Higuchi or Love Story by Indila, the vocals were clearly present and maybe even livelier than I’ve ever heard. This helped their vocals shine through so well that most of the nuances were more than noticeable, making it a unique experience. I preferred a more spacious sound, but the fresh quality of how their vocals were perceived made it hard to stop humming the track. Such a tuning also helped me feel the vocals in Kokoronashi by majiko. The vocals were clearer and sounded more natural when heard and compared to any other IEM. Her vocals had that charming effect that brought the love for the track the same when I heard it for the first time. The clarity and forwardness while maintaining the overall integrity of the presentation was beautiful and nostalgic.  In The Police’s “Every Breath You Take,” the vocal is mixed to sound somewhat in the background, which makes the song sound lifeless. The heaviness and girth in his vocals have vanished, and they don’t sound as natural as they should. The vocals are definitely clear and transparent, but this transparency robs the song of its wholeness in the mix. However, when it comes to tracks like “Wonderwall” by Oasis, where the mix has the vocals forward, they sound magical, just like I felt about “Kokoronashi” by majiko. The transparency and forwardness allow the Gallagher vocals to shine through and sound refreshing. The catch here is that the vocals are stripped of any weighty presence or muddiness in the mix, reviving the freshness in each note conveyed. This is particularly evident in the case of female vocals, but it can be a bit challenging when it comes to male vocals.  **Instruments** Instruments on the other hand feel more like compliments to the vocals, which are prominent in the mix but don’t overlap or blend into them. This presence keeps the vocals the shining star. However, it doesn’t mean that the instruments are left behind; they are well-versed in the mix and have a great presence that sounds controlled, articulated, and on point. For instance, when I was listening to “Runaway” by AURORA, the instruments sounded perfectly fine while exposing her vocals as much as they could’ve. The part where the chorus hits after two minutes have been passed while listening, the drums on the left don’t drown nor do they sound less revealing; in fact, the details are greatly revealed. The presence of other instruments is also not lost, which brings a well-sorted response but just helps the vocals to express themselves better. The track “Thy Art Is Murder” by Keres sounds on a whole new level. The clarity between the kicks, riffs, and growl sounds so beautifully etched into the whole presentation that it doesn’t take away the vibe but brings attention to each and every thing happening into the mix. I was so happy to listen to this track, which revealed so much without sounding offensive. Though I did feel that the bass guitar were barely noticeable and didn’t come across meaty enough. When it comes to the electronic tracks like “Aside From You” by The Toxic Avenger, they sound vibrant and energetic when the drops hit, but it is done so smoothly and efficiently that the whole track sounds musical and pleasing to listen to. Surprisingly, when listening to the track “Viridian” by Shangai Doom, the bass has good heft and control that allows each and every aspect of the track sound clear and forward with vibrance. The sub bass, though, do feel like a little less impactful and deep, but the overall presentation helps make it sound enticing and engaging enough. The catch is that the bass is not all too powerful, and such presence brings less meat and slam into the mix. This also defies the impactfulness and depth of the bass, even though it sounds clear, detailed, and controlled.   **Technical Performance** https://preview.redd.it/6vkw4lihho9f1.jpg?width=8064&format=pjpg&auto=webp&s=97cccc39879e0415f454b63ab65120971770a21d I believe this might be one of the most natural-sounding single-driver IEMs with such technicalities that preserve the smoothness and natural-like sound while delivering excellent details and clarity overall. The soundstage is more spread out but not so much across the headroom. The presence of every note makes it sound more immersive than spacious, although there’s enough width and depth that helps make the overall presentation sound airy. On the other hand, the imaging is clean, sharp, and precise, which helps make the notes distinguishable. The separation between the notes is also well-distinctive and helps pinpoint where the sound is coming from. Even the resolution is good, but the micro nuances aren’t well expressed when compared to the macro nuances. The attack and decay of the notes are fast-paced, which helps keep the mix clean and helps resolve notes better.  **Sound Impressions**  **Exploration With Both Tuning Nozzles and Knob** https://preview.redd.it/zd7yzvieho9f1.jpg?width=8064&format=pjpg&auto=webp&s=111eca9db02074be6a257ef85095efb7075f84a7 Alright, to be honest, I was initially very excited about all the configuration and tuning options these offer. However, as I delved deeper into them, I realized that the standard tuning, which includes the stock nozzle and knob position, makes the most sense. I tried various variations between the knobs and nozzles, but from what I could understand, some aspects weren’t as useful for me personally, while others were contrary to my preferences. **Tuning Nozzles -** The Fission offers three types of nozzles: the stock silver nozzle marked with S, the titanium nozzle marked with T, and the brass nozzle marked with C. Each nozzle has a unique effect, although the differences are subtle. The stock nozzle provides a neutral sound, while the titanium nozzle adds a slight zing to the upper extension and more punch in the bass. The brass nozzle tames the upper extension and adds warmth to the lower frequencies without altering the overall sound profile or tuning. While these differences may not be immediately noticeable, I spent considerable time experimenting with each nozzle to provide detailed descriptions of their effects. **Tuning Knob -** Now, when it comes to the knob, I find it a bit discouraging for personal use. The stock knob position offers the most bass, and turning it clockwise reduces the bass emphasis, drastically changing the response. Surprisingly, the control over the tonality of the upper extensions remains intact, even though the bass emphasis decreases with each turn on the dial. I noticed that the notes sounded leaner with less bass in the mix, but it never introduced an offensive sound. I understand that some people prefer such preferences, but I would have loved a step above of bass emphasis included in this step down of bass emphasis.  **DSP And The App Support** https://preview.redd.it/o43dn47bho9f1.jpg?width=8064&format=pjpg&auto=webp&s=67d049939457fa9ad7b4b83ac0186bfe184abafd Now that Tanchjim offers a DSP option, it’s more versatile than I initially thought. Although there are minor analog adjustments to the sound, such as when changing the nozzles and reducing the bass with knobs, the DSP makes a significant difference. The bass and treble sound a bit different when using the DSP, presenting a unique overall sound. When I used the Type-C connector with the DSP, the bass sounded closer, enhancing its impact and thump in the mix. This made the sound more balanced compared to the stock tuning. The treble was less enigmatic but more mature in revealing the notes. The midrange retained its freshness and transparency, helping to express vocals and instruments effectively.  https://preview.redd.it/2txjvle3io9f1.jpg?width=1079&format=pjpg&auto=webp&s=ee3aa3e4bdb79febf4d3f87bd86999dad32162a6 Using the app also helped make the sound changes more reasonable compared to using the nozzles. In my testing, the app provided the same four official presets as always, besides the default preset: Balance, Pop, Musical, and Nature. Transitioning between these presets had me prefer the Popular preset because I love a neutral sound with a sub bass boost. Though the difference between them was enough to make the response sound different from the stock sound. The Nature preset made the upper midrange sound even more forward and allowed for a better closure with the vocals and instruments. Even though the bass had more oomph, it still lacked the presence in the mix. The Balance preset sounded forward as before but with less emphasis on the bass, making it a bit leaner in the upper frequencies, especially in the lower treble and upper midrange. However, the bass felt tighter and lacked the depth and presence when compared to all the presets. As mentioned before, the Popular preset sounded the best because of my preferences. The bass had more dynamic quality and great emphasis on the sub bass. The bass no longer sounded articulated or tight; instead, it had a deep and impactful resonance, with a clean and noticeable rumble and punch. The lower treble and upper midrange had a more forward presentation but was well balanced when the bass came into play. It sounded more dramatic and concert-like Finally, the Musical preset sounded more provocative in terms of the lower treble and less bodied compared to the Popular preset. This preset introduced a more leaner sound and metallic timbre for me, which I disliked. Other than this, the app also allows pre-made game EQ for some games, custom tuning, and an EQ Forum where you can share your or other’s EQs.  **Pairings**  https://preview.redd.it/fqpv0w6vgo9f1.jpg?width=8064&format=pjpg&auto=webp&s=4d6175e336c4d4a1c2bec671b2f4f0c25e05521d **Sony WM1A -** While listening to Fission with WM1A, the response seemed more spread out but also a bit soft in revealing instruments. Vocals didn’t lose their charm and retained their integrity. The treble had a smoother response, while the midrange sounded as expressive and natural as possible. However, it felt a bit subtle in terms of forwardness compared to other pairings. The bass had more rounded notes but felt controlled and more bodied. Although the bass emphasis was weaker than when using DSP and an iPod stack.  https://preview.redd.it/94vhfq4ugo9f1.jpg?width=8064&format=pjpg&auto=webp&s=b0d132c757a043afaafbdbe44ccf3702ad5f3f62 **FiiO M15S -** While listening to Fission with M15s, the vocals and instruments sounded more revealing. The treble was more present, adding a touch of sparkle and airiness. The midrange had better contrast, expressing the vocals and instruments more effectively. Each note was produced with more refinement. The bass sounded articulate and controlled, with improved dynamics that helped the bass bring more pronounced notes, even if they are barely noticeable.  https://preview.redd.it/eya49c7sgo9f1.jpg?width=8064&format=pjpg&auto=webp&s=ebb1ef1c26e3e6e83a3ea292170fad8076e2475f **iPod 5.5 Gen (Rockbox) with Aune X7S -** While listening to Fission with the iPod stack, the response sounded more forward than before, but with a more blended approach. There was both richness and vibrancy in the vocals and instruments. Although the notes weren’t as transparent, the bass felt more prominent and thumping. The response oozed warmth, making it sound better-bodied than any other pairing. It helped sound more composed and fluid with rich dynamics while incorporating the same immersive, like experience.  https://preview.redd.it/9c7tr6cngo9f1.jpg?width=8064&format=pjpg&auto=webp&s=655233d954bf445978bf8af556eb26784be810fa **Tanchjim Luna -** When I paired the Fission with the Luna AT, I immediately felt that the combination was perfect. There was no aspect of the Fission that made it sound more than it naturally did. As mentioned earlier, the Fission has an immersive and decently wide and deep staging. When paired with Luna AT, the width and depth felt more meaningful, the depth improved, and the bass sound became more prominent without overwhelming the mix. Instead of closing in, the bass had a bodied presence and rumbles were noticeable. Fission, which felt light and airy, sounded more mature and proportioned when paired with Luna AT. The treble had less sparkle but a complete, sounding note. The midrange expressed the vocals and instruments with more weight while trying to maintain the magic it eludes. The bass, as mentioned before, improved in a sense. Overall, I believe this pairing made the most sense and helped achieve some of what I felt was lacking in Fission.  **Tracks** Hana Hope - Destination of the Journey Marina Horiuchi - Mizukagami no Sekai Uru - Kamihitoe Anly - Sukinishinayo LONGMAN - spiral Kohana Lam - a few sentimental RADWIMPS - The Great Escape milet - Anywhere Anytime Arika - Cigarette Arika - blan\_ The Sixth Lie - Shadow is the Light Hiroyuki Sawano - 4eVR Saiki - Tactics Honoka Takahashi - LiLas  Creepy Nuts - Nidone Beat Crusaders - woh i nee Awich - Frontier Rokudenashi - Eureka Rammstein - Sonne Cutting Crew - I just Died in Your Arms Tonight Fleetwood Mac - Gypsy Tom Petty - Free Fallin’ U2 - With or Without You The La’s - There She Goes Toto - Africa Bobby McFerrin - Don’t Worry, Be Happy  Zeal & Ardor - Kilonova Zeal & Ardor - are you the only one TOOL - Vicarious  Lady Gaga - Just Dance Lady Gaga - Poker Face Jay-Z - Run this town Kanye West - Stronger AURORA - Black Water Lilies AURORA - The Seed (LIve from the Royal Albert Hall) Skrillex - MOSQUITOTOUILLE  Skrillex - MORJA KAIJU Skrillex - Recovery  Zeds Dead - RSIH Dion Timmer - The Best Of Me **Conclusion** https://preview.redd.it/qja8h46kgo9f1.jpg?width=4032&format=pjpg&auto=webp&s=a59bfb0cd63fb525e8abe6ea22d723ef6e7854bc Tanchjim is offering what they have developed the best in terms of technology and poured it into Fission and delivered it towards the audiophile community at an affordable pricing. The same in-house sound, the DNA and their expertise under the price segment of 150 USD. I love the fact that they released an IEM that not only has interchangeable nozzles but the tuning knob and a DSP option into one offering regardless of how I personally feel about it. My appreciation for this idea or innovation will never waver yet I would still like them to take into consideration suggestions like more dramatic changes with the tuning nozzles and a step-up bass using the knob. Knowing that all brands are trying to enhance bass response through their switches, filters, and knobs, I understand why they introduced something unique into the market. In a way, I can say that these are one of those that, if not most, but some were eagerly anticipating. Even from an overall perspective, the stock tuning with stock nozzles and the positioning of the knob is perfectly suited for serious vocal enthusiasts who crave nothing but that raw, unfiltered, and pure sound that Tanchjim is renowned for delivering to its fans and consumers. Whether I compare them to the likes of Aful Explorer, Kiwi Ears Airoso, KIMA 2, Delta, etc., or not, there’s a similarity in their technical performance, but tonally, they sound distinct. In this segment, these are the only single DD IEMs that prioritize a mid-centric neutral tuning, which contributes to a smooth and cohesive sound.  Personally, I adore their in-house tuning, and this is undoubtedly a significant improvement in their delivery. However, I couldn’t find much practical use for the nozzles and knobs. I was thoroughly impressed with the DSP option, allowing me to EQ the sound whether in analog or via the app. Consequently, I can wholeheartedly recommend this IEM to anyone seeking a neutral sound with a strong emphasis on vocals and leads, resulting in a smooth and cohesive presentation. If the nozzles or knobs suit your preferences, they might become the best you can expect from a brand, and even if not, I believe the DSP feature will compensate for any shortcomings. 

For a better value from a sound perspective 4U is better and for versatility and value, then it is Fission. But I still find Fission a much clearer and transparent sounding than 4U.

**I THINK I MIGHT JUST HAVE A SINGLE DD KINK.** I recently bought the **TANCHJIM FISSION** and here is my impression/review about them. [ACCESSORIES PROVIDED ALONG WITH THE IEMS.](https://preview.redd.it/06fnob3lhsyf1.jpg?width=4624&format=pjpg&auto=webp&s=3b37a6f6bb6a4e88868a83a4d44ac9fbb324b8f9) **UNBOXING AND ACCESSORIES:** Out of the box we are greeted with a **carrying pouch** (*although being water resistant, the case is dogshit and flimsy af, do youself a favour and get a separate hardcase to store your iems*), 3 pairs of **both wide bore and narrow bore eartips,** an **awesome cable with 4.4mm, 3.5mm and a freaking usb-c DSP swappable termination** and **a screw driver like thing used to rotate the tuning knob**( I will talk about this tuning knob further in the review) and **3 tuning nozzles** named as silver, copper and ttitanium. TBH only the copper and titanium do some changes to it, silver is the same as copper, they just threw the silver so that you can use it as a replacement i guess. [TANCHJIM LOGO SHOWING AN ANGEL](https://preview.redd.it/y7tua7f4qsyf1.jpg?width=4624&format=pjpg&auto=webp&s=a91aee5eacf369cdbfd28308a54ae3bbcafd6684) [TUNING NOZZLES](https://preview.redd.it/tehamv0olsyf1.jpg?width=3378&format=pjpg&auto=webp&s=51d22b119fd0079bed232329bd9ace6bb1eb84a3) Let me **warn** you guys about the termation. This thing is very very tight, mofo left an indent on my fingers when i tried to swap it, LMAO. **BUILD QUALITY AND COMFORT:** I love you tanchjim! for making an IEM that has a metal shell, other brands if you are watching this review then please ditch hollow resin shell and shift to metal. Coming onto the build of the IEM, it is made up of anodized aluminium and this is extremely resistant to scratches, even the glass on the faceplate is surprisingly scratch resistant. Talking about the comfort, these iems are on the smaller size and they fit my ear pretty good. The venting on the iem is also pretty good and since it doesnt use any kind of Balance armature driver so that also helps to remove pressure build up. I never had pressure build up issue with the FISSION. Mind you that I have been using them for 8-9hrs daily so I think most of you using this will not face pressure build up issue. ACCESSORIES USED: Tanchjim fission (ofcourse lol), fiio ja11, apple DAC, spotify/youtube music ( I call lossless audio bullshit), 3.5mm termination along with the cable provided in the unit. **SOUND AND TUNING:** [Just some random shot I took while listening on the fission.](https://preview.redd.it/yzzjndsbmsyf1.jpg?width=2443&format=pjpg&auto=webp&s=975d603b1aa1e7c00b3660be959598ff33993d07) Fisson comes with shit ton of tuning option because of the additon of DSP,NOZZLES and that TUNING KNOB. *NOZZLES:* As I mentioned earlier, copper nozzle and silver are pretty much the same and only difference would be that the copper nozzle is a *bit* lush, just a tiny amount which is not noticeable unless you focus hard, the titanium nozzle however makes the sound a bit grater like, by grater like I mean that it makes it a bit harsh and peaky. *TUNING KNOB:* The fission comes with a tuning knob which changes changes the tuning of the iem, specifically the bass region, by altering the capacitance that the Dynamic Driver is connected to. It lets you use 4 tuning namely pop, default, natural and monitoring. Except for default mode all of them are lean in bass. *The default mode with copper nozzle is close to tanchjim's inhouse tuning so I use it with this combo.* *DRIVER TECH:* Some say that it has the same driver as the TANCHJIM ORIGIN but it is not, rather it uses the same technology called DMT 5 which was used in the origin. I have not used the origin so i cannot compare them but afaik this graphs similar to the origin, very similar, though you should never judge an iem only based on the graph, it only reveals 30 percent about an iem. *DSP:* The dsp is decent, and comes with peq feature but I dont like using this dsp cause it takes out the resolution of the iem and makes it feel low quality. I recommend not using apple dongle also. Pair it with fiio ja11 or something like that as it performs well with some power provided ***Lets talk about the tuning now:*** ***SUB BASS and MID BASS:*** Talking about the sub bass, you might think it is lean and shit, *if* you are a graph sniffer but you know what a well tuned dynamic driver can do? Good quality low end!, I was anticipating the fission to be bad in this area but it is good, really good, one of the best under 150 dollars imo. It never overdoes the sub bass and provides enough rumble(though not insane rumble) to transition smoothly into the MID BASS region. Mid Bass on fission is *wonderful, excellent, high quality, detailed , thumpy, velvety and textured.* **FISSON IS A MID BASS FOCUSED SET.** You know when reviewer say that an iem has less quantiy and more quality bass, most of the times it means that it has shit bass and the reviewer is trying to mask the issue of that iem, but incase of fission this statement is true. The midbass is so coherent and textured, I have never heard an iem under 150 dollars that can bring out the velvet like texture in a bass but fission does that very very well. And the mid bass is not even bloated idk how. Most iems don't transiton well from mid bass to midrange,vocals and often tend to mask them, fission completely avoids that issue and has well separated midbass and sub bass from rest of the music while still being coherent. **EVEN THOUGH IT IS SINGLE DD IEM**( i will keep rephrasing this). ***MIDRANGE AND VOCALS***\*\*:\*\* As i mentioned above, the transiton from midbass to midrange is smooth , very smooth infact, **MIDRANGE AND VOCALS TAKE THE STAGE.** The string plugs on guitars have that reverb, the violin play, the breath of the singer is just so smooth, and it does it in a way where vocals and instrument are brought forward without being peaky and sibilant, it is very smooth. I was listening to Sway by michale buble, and there is part where the voice reverbs, most iems dont do that well and do not bring it to your notice but my god when i was listening that song with fission i was like **WTF!, THIS SONG HAD THAT REVERB!?**. If your song is sibilant it will let you know but it will do it smoothly. If you like vocal focused song, you have got yourself a treat and Some **WTF!** moments. Vocals on these are angellic and natural. ***TIMBRE AND TREBLE:*** Ok guys enough praise, i have a bit of qualm in this region, I wish the timbre was a bit thick and warm, it is still very good but if it were just 3-5 percent more thicker and warmer, it would be destroying iems in the 200-300 dollars ballpark region. Treble is smooth and not peaky, but i advice you not to listen to it at high volume as it can become a bit smeary, at mid volume it is the smoothest treble under 150 dollars, even smoother than some high end iems lol. **OVERALL tuning:** IDK why some reviewers called it neutral warm, i felt like it has a **clean, natural and neutral tuning with both a hint of brightness**( *more bright than warm though the ratio of brightness to warmth would be 60:40* ) **and warmth**, i know i sound crazy but it is somehow warm and bright at the same time. **SOUNDSTAGE AND IMAGING: Another WTF!,** I was blown away by how controlled the soundstage is on this iem. It feels like an orchestra but not artificially wide that it would make the instruements, sound disoriented. See SIMGOT, you dont need to make your iem harsh and thin to achieve good soundstage. Imaging on this is insane, dude! it is so accurate like how **tf!,** First time I put it into my ears I was surrounded by instruments on my left, right,front,back, above and below. The palcement of the instrument is developed so nicely. If you ever game with them, you might be banned as these are basically wall hack LOL!. **EVEN THOUGH IT IS SINGLE DD IEM.** This thing puts some hybrid to shame because of how natural and cohesive the imaging is done on this iem. Feel Free to ask my any questions regarding this set. This is easily a well tuned set, i would even call it class leading, regardless of the pricing. *BTW, if someone got a pendant of the angel in the tanchjim logo then please let me know where can I buy it.*

Thanks.Fission has a very well controlled bass,or I should say "quality" bass.

Best value? Given that I haven't tried the T10 (only the T10 Pro, which are fine), I cannot speak about them but many consider them the pinnacle of budget planars. Here's my (personal) value picks list from 0 to 150$ more or less (will also mention one planar for each bracket): 1. KZ ZVX Pro: it's just impossible to beat these, you can buy them for like 5$ at AliExpress with some coupons or welcome deals and you get all metal build, a well tuned set with decent technicalities for the price and something that, although not breaking the bank, will last long and you won't give a frick you somehow lose them since they cost like a cup of coffee. 2. Under 50: my favourite in terms of signature is the CCA Trio in the UUUU (or 1111) switches config, whereas the EW200 are what I would buy for a bit more resolution. The SGOR Luna and PRX are options as well, but they have some tonal quirks that may not appeal to you. 3. Under 100$: Juzear x Z Reviews Defiant for a versatile, punchy and tight set, Truthear HEXA for resolution, a neutral bright tonality and detail retrieval, Truthear PURE for a neutral/warm set with pretty thick lower end and non-fatiguing treble. Planars? Well, yeah, the F1 Pro for NiceHCK is very solid but it has a tinge of metallic timbre in the treble (other than that, it's SUPER solid). 4. Under 150$: Kefine Quatio for a thick and warm hybrid set with good technical chops, Tanchjim Fission for the best single DD experience and technicalities in this price range, along with an excellent neutral tuning (and some fine tuning thanks to the nozzle filters and bass screw). And then there are also many other sets that are worth a mention, such as the Wan'er S.G. II, the Kefine Klean, the Dunu Titan S2 and Kima 2, the Moondrop May, the AFUL Explorer... So many choices out there nowadays.

TL;DR for those short on time or not inclined to read the entire review: # Pros * Fast and tight bass, well done treble tuning and lively vocals * Very good technical performance and tuning * The interchangeable nozzles, combined with the low-end screw and the DSP settings (with the Type-C connector) provide for a lot of versatility with the tuning * Great overall package and accessories * Very good built quality and comfort, along with decent isolation from external noises * Very high value for money ratio # Cons * Not really a con, but the upper-mids and treble are generally on the brighter side so very sensitive folks should look elsewhere * Not the most incisive mid-bass * Average perceived soundstage * Not really a con as well, but the price of the Fission is so good that there’s a high risk of cannibalizing the Origin, which come with a slightly more refined treble and a touch more bass impact \---------------------------------------------------------------------------------------- # Introduction Tanchjim is a very popular brand in the Chi-Fi industry, and along with some of their flagship models such as the Oxygen and Origin, they have also contributed at populating other price ranges with sets like the Zero and Zero Ultima, the 4U and Bunny, the Tanya and Tanya DSP, the OLA and some other products back in the years.The Fission are their latest IEMs along with their Luna DAC (for which I will also publish a review), combining the DMT5 driver and interchangeable nozzles from the Origin and the shell design and bass tuning screw of the 4U. In this review, I will share my own opinion on the Fission and I’ll be comparing them with some of their competitors. >*Disclaimer: the Tanchjim Fission were sent to me by Tanchjim free of charge so that I could write an honest review. This review represents my personal opinion on the set, it isn't promotional or paid content and I don’t get any revenue from the sales of this product.* *At the time of the review, the Tanchjim Fission were on sale for $129.99 at HiFiGO and Amazon.* https://preview.redd.it/x68ev25a597f1.jpg?width=1500&format=pjpg&auto=webp&s=db9aea25474abadf209be63ef2ba257fb38b4ed5 # Technical Specifications * Driver Configuration → 1 x DD (DMT5 Driver) * Impedance → 16 Ω * Spec-sheet Frequency Response → 20Hz-20kHz  * Sensitivity → 126 dB/VrmS * Cable → 1,2m 2-strand copper silver-plated coaxial LITZ composite twisted wirewith 0.78mm 2-PIN connectors * Plugs → Detachable plugs: 3.5mm, 4.4mm and Type-C (with built-in DSP) included # Packaging The packaging is elegant and contains: * The Tanchjim Fission * The detachable cable with modular plugs (3.5mm, 4.4mm, Type-C) * A soft carry pouch * 2 sets of tips with different bore width consisting in three different sizes each (S/M/L)  * Two pairs of additional interchangeable nozzles (three in total if we also consider those that are already mounted on the earphones)  * User manual https://preview.redd.it/0z0qhu0b597f1.jpg?width=1500&format=pjpg&auto=webp&s=0446f50a09e1f35ba12c7538d13a251fbef06045 https://preview.redd.it/rxfzoq2b597f1.jpg?width=1500&format=pjpg&auto=webp&s=c13e73a93e992fbddfe028ef950cd75fe512bc77 # Design, Build Quality, Comfort and Isolation The build quality is very good: full opaque metal shells, good manufacturing, and even though the earpieces are pretty heavy, they’re comfortable to wear and the isolation from external noises is decent. There’s also a black version of these which is supposed to be a collab set with a slightly different sound tuning but I do not have much other information. There’s also a bass tuning screw on the ear-facing side of the shells, with which the user can interact using the small screwing tool provided in the box. https://preview.redd.it/04ja6ltb597f1.jpg?width=1500&format=pjpg&auto=webp&s=366f574d646b87179c3ab9f2c8ba71e00b7c6f15 The nozzles are pretty wide, so those with very small ear-canals should take this into account, and they are interchangeable since there are three different nozzles provided. Each nozzle has an o-ring to improve the tightening process, even though that means you have to be careful when inserting it properly, otherwise you’d screw it in wrongly and could damage the screw thread.  https://preview.redd.it/xmzxha3d597f1.jpg?width=1500&format=pjpg&auto=webp&s=8e77e07e4b2b98ba8de542a92816f1d80ce58420 # Cable The cable is braided, very comfortable to wear and it’s not prone to tangling. The 0.78mm connectors are slightly longer than average.There’s a chin slider and the plugs are interchangeable as well: you can use the 3.5mm jack, the 4.4mm balanced jack and the Type-C plug that can interact with the Tanchjim app to play with DSP settings and EQ. https://preview.redd.it/j880a6hc597f1.jpg?width=1500&format=pjpg&auto=webp&s=a5637c803cb444269469ce4f48f416513ff5081a https://preview.redd.it/gtckt6hc597f1.jpg?width=1500&format=pjpg&auto=webp&s=333d32b47e44fa753c38c062a37c84929f1769e0 # Sound **GEAR USED FOR THE TEST** * DAC: Topping E30  * AMP: Topping L30, Fiio A3 * Mobile phones: Samsung Galaxy S7 Edge, Xiaomi Mi A3, Samsung Galaxy S23 Ultra * Moondrop May’s DSP cable with PEQ=0 * Dongle: Apple Type-C dongle, Fosi DS2, Kiwi Ears Allegro Pro, Tanchjim Stargate 2, Dunu DTC480, Dunu DTC800, Truthear SHIO * Portable DAPs: Snowsky Echo Mini, Benjie S8/AGPTEK M30B * Bluetooth DACs: Snowsky Retro Nano, FiiO BTR11 * Bluetooth Adapters: KBEAR S1, KZ AZ10  * Other sources: Presonus AudioBox iONE, Elgato Wave XLR **Amplifier needed?** No, an amplifier is not strictly necessary. **Let’s speak about the sound.I will be speaking about the stock “S” nozzle, which is basically the same as the copper “C” nozzle.**  It’s pretty hard to describe the Tanchjim Fission in terms of sound signature because these are generally on the neutral side but they’re not dead-neutral or boring at all. There’s a right amount of mid-bass punch, even though these are not the most impactful IEMs around, good end-to-end extension, on-point vocals, and everything just feels right in quantity. The mid-bass is more in focus than the sub-bass, it’s tight and can keep up with very fast tracks without struggling. The male and female vocals have the right timbre, the treble has a lot of clarity and great detail retrieval for the price, the imaging and instrument separation are very good and the soundstage is also pretty good for the price with nice depth and width. Those who are very sensitive to upper-mids and treble should probably stay away, even though I really think that Tanchjim has put lot of effort at tuning these and it’s pretty evident considering the fact that they sound energetic, bright and very detailed yet not to the point of sounding harsh or fatiguing: it’s a well-done kind-of bright set. The **soundstage** is of average size, literally nothing to write home about, whereas the **imaging** is pretty good for the price. **What about the tuning filters?** The S and C nozzles sound basically identical and are the nozzles that I will keep using. The T nozzles, instead, emphasize the upper mids and reduce the low-end leading to a thinner signature that is borderline shouty when it comes to vocals and that lacks some note weight due to the tamed low-end. **Are they something I would use considering my taste and preferences?** Yes, yes and yes again. It’s not a unit that I will use during my daily commuting since I prefer bassier sets for that purpose, but it’s definitely a pair of IEMs that I love using at home while sitting on the sofa or in front of my PC enjoying various genres. # Some comparisons: **Tanchjim Fission (Atmosphere Switch, S nozzle) vs Tanchjim Origin (Nozzle L)** >What amazes me is the performance of the Fission, which is VERY close to the Origin for a much lower price. I’d say the Fission goes toe-to-toe with the Origin in terms of technical performance, and the main difference is probably the level of refinement in the upper-midrange and treble region, where the Origin sound a touch more refined and with a slightly more natural decay in the upper treble, a bit more forwardness in the upper-midrange, and slightly superior detail retrieval even at lower volumes.The bass quality is very similar, and although the Origin’s bass is a notch more impactful, both reproduce super tight bass and can keep up with very speedy tracks. The Origin have a slightly warmer and thicker lower midrange (not a “night and day” difference though) as well because of the previous consideration related to the bass response. You can swap the nozzles on the Origin and so you can do on the Fission, but the Fission also has the low-end screw to adjust the quantity of low-end (personally, the Atmosphere switch position is the one I will keep as I have noticed that there’s too much reduction in the bass region when interacting with it), so you actually have more versatility with the Fission (and yes, there’s also the Tanchjim app that adds even more customization). In terms of build quality, the Origin looks and feels more premium because of the glossy shells, but both are built like tanks. The Fission comes with a braided and more flexible cable and despite it looks like a slightly less premium cable than the one provided with the Origin, it also has modular plugs (and one of them is the Type-C plug with DSP capabilities so you can also use the Tanchjim app with the Fission). I can see the reasons why some folks out there would feel the Origin are a tiny bit more refined, but the Fission are just unbeatable in terms of quality/price ratio: I would pick the Fission hands down and I really think that the Origin are at risk of being cannibalized by the Fission. **Tanchjim Fission (Atmosphere Switch, S nozzle) vs Tanchjim 4U (Atmosphere Switch)** >The Fission are more expensive and they’re worth the price difference imho: better detail retrieval, superior imaging, better soundstage, better vocals, better bass and overall better packaging and accessories. Not saying that the 4U aren’t good, because they are and they were actually the first set from Tanchjim featuring the low-end screw, but the Fission are just better at everything.If you have the budget, go with the Fission. **Tanchjim Fission (Atmosphere switch, S nozzle)  vs Dunu Kima 2** >I like the Dunu Kima 2 mainly because of their very warm and balanced timbre that makes them easy to recommend to everyone. It’s among the most easy-going sets out there when it comes to the upper mids and has good end-to-end extension so everything makes up for a natural-sounding, no-frills set.The Fission are better when it comes to the bass quality, speed and tightness, the detail retrieval, the imaging and soundstage capabilities, and the overall resolution is just superior. The Kima 2 are more relaxed in terms of timbre and offer less forward vocals with a more “mellow” approach. Both come with great cables and accessories and both are built extremely well. Comfort is good on both sets, whereas isolation is better with Fission in my ears also because of their deeper insertion. The Kima 2 also feature modular plugs but there isn’t any Type-C plug so the Fission still provides more tuning choices thanks to the interchangeable nozzles, the low-end screw and the DSP/EQ presets from the Tanchjim app if you use the Type-C connector. **Tanchjim Fission (Atmosphere Switch, S Nozzle) vs Simgot EA1000 (Red Nozzle)** >This is a tough one but the fact that this comparison exists is already a big endorsement for the Fission. Overall, the EA1000 still feel like they’re a notch above, mostly because of the bass quality and impact and because of the bright yet well done treble response. The Fission, in comparison, has a more neutral signature with less emphasis on the treble and bass, and this kinda gives the EA1000 a chance to be perceived as more contrasty and more fun to listen to, even though this comes at the expense of a more fatiguing upper end. In terms of imaging, the EA1000 still has a slight advantage, and so applies when it comes to the soundstage. The EA1000 has interchangeable nozzles but the Fission also has the low-end screw along with interchangeable nozzles so there’s a bit more choice in terms of tuning. The build quality is great on both sets, but the EA1000 look and feel more premium. Comfort and isolation are comparable. Packaging and accessories are good with both sets, but the Fission comes with better stock tips and with modular cable plugs (and, as said before, the Type-C plug adds more sound customization). I still prefer the EA1000 but the Fission have superb technical performance as well and their value for money is almost unbeatable. **Tanchjim Fission (Atmosphere Switch, S Nozzle) vs Kefine Klean (Silver Nozzle)** >The Black nozzle on the Kefine Klean sounds pretty shouty and harsh with respect to the Silver nozzle so I have used the latter for this comparison. Overall, the Fission is notch above in terms of technical performance, but it’s very interesting to hear what you can get for about 50$/60$ in 2025. The Klean are very resolving for their price and also have pretty good imaging, and even though they can’t keep up with the Fission under certain conditions, they are still impressively good. The Fission has better bass, better detail retrieval, better timbre, and overall they come with better resolution and you can also fine tune them thanks to the interchangeable nozzles, the low-end screw and the Tanchjim app while using the Type-C connector. Both are built very well, but the comfort on the Fission is better and so is the isolation. Packaging and accessories go to the Fission as well and the cable with modular plugs is the icing on the cake. I like the Klean and their price is right for what they offer, but if you have the budget for the Fission just get them and enjoy a superior and more refined product. # Final Thoughts The Tanchjim Fission bring many good things from the Origin to a lower price, offering some serious technical chops, a well-done tuning and a complete package in terms of accessories and sound customization. These come with my absolute highest recommendation, as I can't pinpoint any significant weaknesses that could represent true dealbreakers. Tanchjim has done a great job and things done well always deserve my attention. However, the title of my review was chosen for a reason: there's a high risk of cannibalizing the sales of the Origin, because even though the latter are even better, the small refinements and improvements that you get on the Origin are probably not worth the price jump (which is almost about 100$). I would really think about this if I were Tanchjim because the Fission are among the best bang for the buck sets you can get in the sub-150$ but they're so close in performance to the Origin that this can pose some risks.

Yea that's the main issue. I really think that the fission are too good to be priced so low compared to the Origin. And I do not mean too good in general because there are lots of very good IEMs in the sub-150$ (for sure the Fission are the best single DD IEMs under 150$), but too good for their product portfolio specifically. The fact that I have underlined multiple times is something that should catch Tanchjim attention because many reviewers and users (not that reviewers aren't users, but we generally have the chance to hear more stuff) are pointing this out. You're another living proof ahaha

The Quatio are warmer, thicker sounding. I prefer the Fission, they are a bit more technical and more neutral, and they sound cleaner overall. The Quatio are more fun instead: quite technical as well but in another type of way, let's say. If you want a neutral and detailed set, go for Fission, otherwise if you want a warmer, thicker and bassier set, the Quatio are better but you give up on detail retrieval and sparkle with respect to the more versatile Fission.

Maybe something like the tanchjim fission? You can change the tuning and nozzles whenever you wish to and there is DSP with EQ APP for tanchjim.

I have Tanchjim 4u so i didn't buy anything below its price point from Tanchjim and went with purchasing Fission (got it for 105 usd) which sound better thn 4u which compliment the driver upgrade. I tried final eartips with moondrop DSP type C cable in 4u which almost giving me same vibe as fission but again Fission overcome as winner for its engaging and slight upgrade with layering & separation. i found golden nozzle with pop mode using type C as my go to setting giving me good musical and yet analytical sound. Almost all tanchjim iems have same in house sound so i will go for another brand after this 2 purchase.

It depends on what you want. Variations is tuned towards Harman. If you want something that is like the variations but a bit better I would either look into the I/O Volare or wait for the Mooondrop Meteor x Crinacle DE (The issue with the meteor is the lack of bass, only decent mids but really good treble and crin said collabed with mooondrop to fix that. Like with the blessing series). [https://graph.hangout.audio/iem/5128/?share=JM-1\_Target,Variations,Volare,Moondrop\_Meteor&bass=8&tilt=0&treble=-4&ear=0](https://graph.hangout.audio/iem/5128/?share=JM-1_Target,Variations,Volare,Moondrop_Meteor&bass=8&tilt=0&treble=-4&ear=0) If you want an iem next to your Variations that is just more vocal forward I would either go for something cheaper like the Tanchjim Lineup (Nora,Fission, Fola) or for a bit more something like the Softears studio 4. If you want something that has good vocals but also bass, I would look into the Softears Volume s or any other jM1 tuned Iem like the crinear daybreak, Ke4, Ziigaat Odyssey 1/2, Mooondrop Dusk (and many more) or something like the Ziigaat Luna. Ps. You could also consider to try out some EQ and add a bit more lower midrange and maybe a bit more mid bass. Something like this might work for you. https://preview.redd.it/zn3o9psp46tf1.jpeg?width=1080&format=pjpg&auto=webp&s=1a11b179c593b4f5707192bf77cd1be58c94e415