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Tanchjim Oxygen

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    Tanchjim Oxygen technical specifications:

    • Type: dynamic driver IEMs
    • Dynamic driver: High performance dual chamber / dual brake
    • Diaphragm: carbon
    • Frequency range: 10Hz — 40kHz
    • Imdepance: 32Ω
    • Sensitivity: 110dB
    • Distortion: <0.2%
    • Noise reduction: 37db
    • Cable connectors: 2pin, 0.78mm
    • Color options: silver, black
    • Audio Cable: 1.2m, Sliver-plated OFC
    • Plug: 3.5mm gold-plated, straight
    • Smartphone cable: 1.2m, with inline mic and remote
    • Plug: 3.5mm, straight
    Other declared features:
    • Driver technique: Carbon nanotube dual-chamber / dual brake dynamic multi-tuning allows Oxygen to expose more details and show beautiful tone rendering
    • Process and materials:
      • The outer shells are hand-polished (right shell contains unique ID)
      • Each pair of headphones is unique due to hand-processing
      • 304 grade stainless steel ensures the safety of use and no irritation to skin
      • Nano-grade silver ion vacuum plating technology applied to 02 cavity helps to resist bacterial contamination

Recent Reviews

  1. Animagus
    Tanchjim Oxygen - Excellent sounding tiny
    Written by Animagus
    Published Aug 18, 2019
    Pros - Great Sound Quality - Harman-ish Tuning.
    - Comfortable natural sound signature.
    - Good deep bass, clear mids with smooth but defined treble.
    - Tonality.
    - Good resolution for a single dynamic driver.
    - Build Quality.
    - Good packaging.
    Cons - Fit isn't the best yet stays in your ears comfortably.
    - A single better cable could've been provided instead of two different cables.
    My background- I am a professional musician, producer and an audio engineer by education, with experience in the performing, recording and pro-audio industry. I test products on a technical and musical level, and try to write reviews as simple as possible from a music fan's perspective.

    Disclaimer – The sample was provided for a test and review. I am not affiliated with the company and write this review with my best unbiased opinion regardless of how the review turns out.

    Genre preferences- I majorly listen to rock, acoustic, pop and metal genres and occasionally checkout EDM music which is doing the rounds on the radio and charts.

    About the product - Tanchjim Oxygen is a single 10mm dynamic driver in-ear monitor which sells for around $270. It is available in 2 color options, silver and black.

    1.jpg 2.jpg

    You can buy the Tanchjim Oxygen from Shenzhen Audio

    1. Driver Tech - 10mm Dynamic Driver
    2. Diaphragm Type: Carbon Nanotube Diaphragm
    3. Frequency response: 10–40,000 Hz
    4. Sensitivity: 110 dB
    5. Impedance: 32 ohms
    6. Plug: 1/8 in (3.5 mm) Gold-Plated Line Plug
    7. Cables: 1.2m OFC Silver Plated Cable Without Mic & 1.2m OFC Cable With Mic
    8. Interface:0.78mm 2Pin
    Included in the box-
    1. Oxygen
    2. 2 Cables – One with mic and one without.
    3. Silicone eartips – 7 pairs
    4. Carry Case
    5. Metal sticker with brand name and logo
    6. Warranty card, counterfeit protection card and short user guide

    Build Quality – Tanchjim gave me choice of color and I chose black. The shells are made of metal and are finished very well. One shell spots their logo and the other spots the name ‘Oxygen’. The seam between the faceplate and the shell is done perfectly too. The color plating is so good that there isn’t a scratch on the shell or the nozzle in my 2 month’s usage. Or maybe I haven’t used them in extreme conditions enough. Haha

    They’re one of the few companies who include 2 cables in this price range, one with mic and one without. But sadly, both the cables don’t live up to the premium feel of the package and IEMs. I would’ve been happier if they included a higher quality cable as stock in the package even if they had to chuck the mic cable to cut costs.

    6.jpg 7.jpg

    Tanchjim Upgrade Cable – Tanchjim however sent me their upgrade cable too and I love it! The wire is 5N single crystal copper. It is covered in a black cloth sheath which looks very good and gives me an impression of being solidly built. The connectors and jack are of good quality too. This cable conducts better than the stock and is definitely an upgrade.


    Fit and Comfort – Oxygen’s shells are extremely light to be comfortably worn for long periods but if you’re looking for a snug fit where the nozzle goes in and the rest of the shell fills up the concha, sadly this is where the Oxygen falls short. As some people reported, the nozzles really are short and stout. It would’ve been great if they had designed it to be a little bit longer. Nevertheless, the shells sit in my ear really well and don’t fall out if my shake my head heavily. Most of the time when I’m wearing it, I don’t even know they are there.


    Sound Analysis – Tanchjim has tuned Oxygen very well along the lines of Harman Target curve and ensured that the bass goes deep, mids are transparent and treble is sparkly and clear. It has a very clean character with very good amount of details for a single dynamic driver.

    Bass – Oxygen being a dynamic driver re-creates the bass really well. The sub-bass has good reach and mid-bass is tasteful, but in no way does it dominate the track. It’s very well balanced compared to the rest of the frequency spectrum yet very clear, crisp and impactful. Notes have good authority and are distinguishable even in heavy layered music. You can hear and feel the bass rumble in songs like Porcupine Tree’s ‘The Start of Something Beautiful’ and ‘Halo’. It got me pretty excited about the song and I heard them in loop a couple of times.

    Mids – If you’re familiar with Harman mids, you know how they look on a graph. Oxygen’s mid dip is very natural and makes lower mids sound very clear. This complements the clarity in the upper mids perfectly. The resolution is extremely good too. As a result, in heavily layered songs, snare body or lower registers of vocals never get shadowed by pads, mid bass or synths.
    • Deep vocals in songs like Coldplay’s ‘Another’s Arms’ and ‘Yes’ have good depth, clarity and sound upfront without getting lost in the mix.
    • Falsettos and higher range vocals in songs like Gavin James’ ‘Always’ and Maroon 5’s ‘Payphone’ always sound clear and crisp but never piercy.
    • Acoustic guitars have good string clarity and presence but never sound sharp.
    • Distortion guitars in songs like Breaking Benjamin’s ‘Diary of Jane’, Kanivool’s ‘Simple Boy’ and I Am Giant’s ‘Razor Wire Reality’ sound huge and have very good tonality, definition and clarity.
    • Kicks have good attack and snares have good body and depth.
    Treble – In earphones with Harman style tuning, the treble can tend to sound a bit rolled off but the Oxygen portrays it quite well. Oxygen is not a dark sounding IEM at all. Treble character will probably please most with its naturalness. The treble supports the high mids very well giving guitars a good hint of airiness, snares have good stick attack and orchestral instruments have good sheen. There is no issue of sibilance at all. All in all, the treble is smooth, yet has good sheen, definition and clarity.

    Soundstage, Imaging and Separation – Oxygen’s soundstage has good width and depth. Hard panned guitars sound open and wide, and reverb have good depth to give you a realistic experience. Imaging is on point, with instruments placed accurately throughout the space. Separation for a single dynamic driver is commendable.

    Comparisons –
    • Tanchjim Oxygen vs Moondrop KXXS ($189) – Oxygen and KXXS are similar in terms of build and the choice of driver but differ more in sound. Both are made up of metal shells. Both are available is shiny silver finish but Oxygen is also available in Black (the one I have). In terms of sound, Oxygen sounds organic, nicely balanced and earthy (lifelike like listening to the song in a studio), whereas KXXS has similar qualities but sounds a bit more open, airy with a slightly thinner character.

      Bass and sub-bass in isolation are very similar. In order to gauge the quantity and quality, I listened to Hans Zimmer & James Newton Howard’s ‘Why so serious’ at the 3:26 mark over and over again. After back and forth about 20 times, I’m still unsure which has more sub-bass, ummm....maybe KXXS. Oxygen on the other hand presents slightly more mid-bass in songs like Porcupine Tree’s ‘.3’. Vocals sound earthy in the Oxygen but sparkly in the KXXS. High mids are a bit more present in KXXS so acoustics, hi-hats and orchestral instruments have a bit more presence in tracks. Snares also have slightly more stick attack and smack in KXXS whereas Oxygen again sounds more organic.

      Oxygen and KXXS are like brothers. Oxygen is the more mature brother whereas KXXS is the more adventurous and enthusiastic one. As for fit, KXXS fits much better than Oxygen but Oxygen has a lip for ear tips to stay in place.
    • Tanchjim Oxygen vs Tansio Mirai TSMR-3Pro ($220) – Oxygen and 3Pro have different tech inside where Oxygen has a dynamic driver and 3Pro has 3BAs. Oxygen has more bass presence whereas 3Pro has slightly fuller mids in comparison. As a result, 3Pro has more snare slam and sounds a bit warmer, more towards neutral. On the other hand, Oxygen portrays a cleaner mids character because of the Harman dip in the mids. 3Pro has a bit more 3kHz presence and as a result distortion guitars in bands like Periphery and Lamb of God sound a bit more present in the mix. Treble in both sounds natural and compliments higher mids very well. There is no sibilance in either IEMs.

    • Tanchjim Oxygen vs LZ A6 – A6 with its filters gives you more flexibility in tuning the sound signature. But considering LZ A6 with my favorite Red filter, I prefer Oxygen for its overall tonality, balance and character. A6 is energetically tuned with treble taking the lead whereas Oxygen in comparison sounds much better balanced and refined, targeting the Harman tuning.

    Conclusion – Tanchjim deserves a pat on the back for tuning Oxygen. It is an excellent specimen of Harman tuning and is one of best sounding IEMs under $300. The build quality and packaging is great too. If only it had a better fit with shells being slightly bigger and the nozzles a bit longer, it would’ve been a perfect IEM that I would never want to part with ever in my life. Also, even though they include 2 cables in the package (one with mic), I wish they had chosen to include a single better-quality cable instead. Nevertheless, Tanchjim Oxygen is a very good IEM with great sound and I can recommend it for its sound and build quality, wholeheartedly!

    Gear used for testing -
    1. Logic Pro X session with hi-res test tracks played through Universal Audio Apollo
    2. Macbook Pro
    3. Hiby R6 Pro
    4. Oneplus 7 Pro
    1. View previous replies...
    2. iBo0m
      You should, they're very good on short nozzle and doesn't bend as SpinFits tends to! Actually, getting them might be a challenge, I've got them directly from Azla. Maybe some local Asian's stores might sell them but some of them doesn't ship abroad (IDK where you are from...).
      iBo0m, Aug 29, 2019
      Animagus likes this.
    3. Animagus
      @iBo0m Okay cool! I'll keep an eye out for them. :)
      Animagus, Aug 29, 2019
      iBo0m likes this.
    4. iBo0m
      Good luck! If you won't be lucky to find any, you can always try to get in touch with Azla directly and see :) They also sell "light" version which is available exclusively at Azla (maybe they started to export it to re-sellers by the time I got mine, IDK).
      iBo0m, Aug 29, 2019
  2. darmanastartes
    Written by darmanastartes
    Published Jun 22, 2019
    Pros - balanced tuning, highly resolving, fast, great build quality and finish
    Cons - fit issues, cables should be better at this price point
    2019-06-22 10.47.10 1.jpg
    The Tanchjim Oxygen is an in-ear monitor with a single 10mm diamond-like carbon diaphragm dynamic driver per side. This review is based upon a retail unit purchased by me at list price for personal use from Linsoul Audio.

    I have used the Tanchjim Oxygen with the following sources:

    Windows 10 PC > JDS Labs The Element > Tanchjim Oxygen
    Pixel 3 > Fiio BTR1K (Bluetooth Apt-X) > Tanchjim Oxygen
    Windows 10 PC > Fiio BTR1K (USB-DAC) > Tanchjim Oxygen
    Pixel 3 > Apple USB-C to 3.5mm dongle > Tanchjim Oxygen

    I have tested these headphones with local FLAC and Spotify Premium.

    2019-06-22 10.47.12 5.jpg 2019-06-22 10.47.12 8.jpg
    The Tanchjim Oxygen comes in a mid-sized grey cube-shaped package. The front panel of the slipcover bears a rendering of the IEM, as well as the model name, the Tanchjim logo, and manufacturer tagline “Feel more, Hear more.” The left- and right-side panels bear the Tanchjim logo and the model name, respectively. The back panel of the slipcover shows an exploded diagram of the IEMs, along with specifications and manufacturer contact information. This information is presented mostly in Chinese.
    2019-06-22 10.47.10 2.jpg
    Underneath the slipcover and a top lid removing the slipcover reveals a series of smaller overlapping boxes, the topmost containing the eartip selection, a warranty card, a card indicating how to attach the cable, a QC pass chit, an owner’s manual, and a set of 20 spare nozzle filters. There are two sets of dark grey silicone eartips, one set of short, wide bore tips (S, M, L) and one set of more typical eartips (S, 2xM, L).
    2019-06-22 10.47.12 7.jpg 2019-06-22 10.47.11 4.jpg
    Underneath this top box is a mounting foam sheet holding the IEMs faceplate-up, and a box containing the zippered carry case. The carry case is on the small side, made of dark grey leather embossed with the Tanchjim logo in black. The carry case will fit the IEMs with either of the included cables, but if you use a bulkier braided aftermarket cable with the Oxygens you will likely need a larger carry case. The two included cables are stored underneath the foam mounting sheet.

    The Tanchjim Oxygen’s housings are polished dark grey stainless-steel slabs in the shape of a heavily rounded right triangle. The machining and polish are impeccable. The left and right faceplates bear the model name and manufacturer’s logo in black. The standard .78mm 2-pin cable connections are flush with the housing on the forward-facing side of the IEM. “Tanchjim Oxygen” and “L/R” is written on the inner surface of the housing in silver. The forward-swept short nozzles protrude from the bottom corner of the housing. The serial number is written in silver around the nozzle of the right earpiece.

    Each earpiece has two circular vents, one above the nozzle on the inner side of the housing, and one on the rear-facing side. There is no driver flex, but I did experience diaphragm popping upon first insert in the first day of using the Oxygens. This only occurred while using dual-flange eartips. The nozzles have substantial lips, which facilitated use with a wide variety of eartips.
    2019-06-22 10.47.11 5.jpg
    The 2-pin connections are snug and secure, but are slightly recessed, limiting alternative cable options. The mic’d cable is encased in a black rubbery sheath, while the OFC silver plated cable is enclosed within a clear plastic sheath. Both cables have straight 3.5mm terminations, use pre-formed plastic ear-guides, and have blue or red dots on the 2-pin housings to indicate left or right. The silver cable has a choker, but the mic’d cable does not. The silver-plated cable is flexible but does have minor microphonics. The mic’d cable is more microphonic than the silver-plated cable. Neither cable is prone to tangling. The pause control on the mic’d cable works as intended, but the +/- volume controls trigger an increase or decrease to maximum or minimum volume rather than a single volume step change. I did not have the opportunity to test mic call quality before writing this review.

    2019-06-22 10.47.12 6.jpg
    The Tanchjim Oxygen is intended to be worn cable-up only. The Oxygen has a shallow insertion depth and the housings are on the small side, but because the cross-section of the Oxygen is more aesthetic-focused than ergonomic I did experience some discomfort after prolonged wear over the course of several weeks.

    Extensive tip rolling is essential. For me, getting a secure fit and a good seal was troublesome with any but the largest conventional silicone eartips. I settled on using Sony Hybrid type tips, which are made of a grippier material than most eartips. Double or triple flange eartips will also work. Noise isolation is average for a single dynamic driver design.

    The Tanchjim Oxygen has a cool, neutral-ish tuning with an emphasis on presence, detail, and clarity.

    The Oxygen has accurate, insistent bass. The well-extended sub-bass is slightly elevated compared to the mid-bass. The mid-bass is impactful yet precise and does not bleed into the lower mids at all. Bass comes across as textured despite the restrained presentation. There is some rumble but little slam. Bass articulation is lightning-quick.

    The midrange tonality is dead neutral, and listeners coming from IEMs with a warmer tonality will likely find it cool. The lower mids are recessed compared to the upper mids, but male vocals are crystal clear. Both male and female vocals can overshadow instruments in the lower midrange. Female vocals are vibrant without being sibilant. There is enough presence to render detail and grit convincingly, but not so much that the IEMs are inherently harsh.

    The treble is crisp and energetic with ample air and sparkle. Transients are very natural sounding. Resolution is outstanding but unforgiving to poorly recorded sources. Instrument separation is superb. Soundstage is small compared to hybrid or multi-BA designs but compares well to other single dynamic designs. The Oxygen is the first IEM I have heard that has “holographic” imaging.


    My measurements were conducted with a Dayton iMM-6 microphone using a vinyl tubing coupler and a calibrated USB sound interface. The measurements use a compensation file derived from comparing my raw measurements with Crinacle’s published measurements. The measurements are presented with 1/24th smoothing. There is a resonant peak at 8k. Measurements above 10k are not reliable.

    With a sensitivity of 110dB and an impedance of 32ohms, the Tanchjim Oxygen can be driven to comfortable listening volumes with a smartphone or dongle but will benefit from the additional headroom provided by a dedicated source if one wants to listen at high volumes. I did not notice hiss with any of my sources.

    Tanchjim Oxygen [$270] vs Nicehck M6 (brass filter) [$94]
    M6 vs Oxygen.jpg

    The Oxygen has much more extended sub-bass. The Oxygen’s bass is faster, better articulated and is much less boomy. The M6 has more textured bass. The M6 has more slam than the Oxygen. Even with the brass filter, the M6 has more midbass bleed than the Oxygen.

    The M6 has a warmer, less recessed lower midrange, and a more aggressive upper midrange. The M6 has more intimate midrange, while the Oxygen creates more space between the listener and vocals. The M6 is more prone to harshness and sibilance.

    The M6’s lower treble is elevated compared to the Oxygen. The M6 has more sparkle but less air. The Oxygen has more realistic transients. The M6’s treble is splashy in comparison.

    The Oxygen is more detailed and resolving. The M6 has a much larger soundstage. The Oxygen has better instrument separation and more precise imaging. The M6 is slightly easier to drive.

    The Oxygen has a more premium unboxing experience and a greater variety of eartips. The Oxygen includes two cable variants and a higher quality case, but the case included with the M6 is larger. The M6 is tunable via swappable filters.

    Tanchjim Oxygen [$270] vs Simgot EM1 [$60]
    Oxygen vs EM1.jpg

    Despite the price difference between the two, the Oxygen and the EM1 have similar frequency responses. The Simgot EM1 has slightly better sub-bass extension. The Oxygen’s bass is faster and better articulated.

    The two IEMs are nearly identical in frequency response between 40hz and 4000hz, where after the EM1 exhibits a pronounced 5k peak. With that said, the EM1 has a warmer midrange tonality and a slightly brittle timbre compared to the Oxygen.

    The Oxygen has more air than the EM1. The Oxygen is significantly more detailed and resolving.

    The EM1 has a slightly wider soundstage, but the Oxygen has better imaging and much better instrument separation. The EM1 is easier to drive.

    The Oxygen is more comfortable but the EM1 sits more securely in the ear. The EM1 has a venting issue that the Oxygen does not have. The EM1 has a more premium unboxing experience and a similar variety of included eartips but does not include a real zippered carry case. I prefer the braided cable that comes with the EM1 to either of the cables included with the Oxygen.

    2019-06-22 10.47.11 6.jpg

    The Tanchjim Oxygen is a lightning-quick, highly resolving IEM with outstanding instrument separation and imaging. However, the unboxing experience is underwhelming given the more premium packaging of IEMs which cost less than 1/3rd of the price of the Oxygen, and while the design and finish of the IEMs themselves are astonishing, the cables are disappointing at this price point. Commendable from a performance standpoint but not the best value in IEMs.
  3. IryxBRO
    Tanchjim Oxygen — the most from dynamic IEMs
    Written by IryxBRO
    Published Jan 22, 2019
    Pros - great bass texturing and reproduction, full bodied mids, accurate treble, wide stage, good fit
    Cons - not found
    Some time ago we’ve been reviewing Tanchjim single dynamic driver IEMs with the name that perfectly described its overall design and sound tonality — DARKSIDE. Those were bass-oriented with warm timbre, perfect look and excellent fit.


    Recently, Tanchjim has released the new and more advanced model that inherits some of the best features of initial one and targets significantly higher price segment. This new model is called Oxygen and we believe that, again, this name should give us a clue about its design and sound characteristics: light and clear look, airy and transparent sound. By the end of this review we should be able to object or admit this statement. By the way, both models are doing very well in Japan, with lots of Tanchjim fans out there.


    Tanchjim Oxygen technical specifications:
    • Type: dynamic driver IEMs
    • Dynamic driver: High performance dual chamber / dual brake
    • Diaphragm: carbon
    • Frequency range: 10Hz — 40kHz
    • Imdepance: 32Ω
    • Sensitivity: 110dB
    • Distortion: <0.2%
    • Noise reduction: 37db
    • Cable connectors: 2pin, 0.78mm
    • Color options: silver, black
    • Audio Cable: 1.2m, Sliver-plated OFC
    • Plug: 3.5mm gold-plated, straight
    • Smartphone cable: 1.2m, with inline mic and remote
    • Plug: 3.5mm, straight
    Driver structure:


    Other declared features:
    • Driver technique: Carbon nanotube dual-chamber / dual brake dynamic multi-tuning allows Oxygen to expose more details and show beautiful tone rendering
    • Process and materials:
      • The outer shells are hand-polished (right shell contains unique ID)
      • Each pair of headphones is unique due to hand-processing
      • 304 grade stainless steel ensures the safety of use and no irritation to skin
      • Nano-grade silver ion vacuum plating technology applied to 02 cavity helps to resist bacterial contamination

    Packaging, design and materials:

    Tanchjim Oxygen come in grey square box with only brand name and logo printed at the front. There is no outer cover as seen in DARKSIDE, neither there is any additional data or picture of the IEMs. Very minimalistic approach.


    The innner box compartment is split into 3 layers: box with accessories at the top, soft foam retaining IEMs in the middle and another accesory box along with audio cable compartment at the bottom.


    In fact, the contents of the box are quite rich:
    • Oxygen IEMs
    • audio cable for pure audio sources
    • audio cable with inline remote and mic for smartphones
    • 7 pairs of silicone eartips
    • Aluminum plate with brand name and logo
    • storage case
    • warranty card
    • conterfeit protection card
    • short user guide

    The most irregular here are 2 cables provided from the factory. We don’t remember reviewing any other IEMs that would give you same options straight out of the box. Of course, this makes Oxygen more universal in terms of usage scenarios but we’d still vote for other cable options or adaptors for different output standards — 2.5mm balanced/3.5mm unbalanced/4.4mm balanced. This would give more freedom to any audio fan and justify higher price tag.


    Storage case is another great accessory to have out of the box. It is neat, good looking and has the brand logo empossed at the top.


    Oxygen shells are made of two perfectly aligned stainless steel parts: top cover and base. The joint is imperceptible to finger touch and almost invisible. Top cover has the additional grinding across the surface with polished model name (right channel) and brand logo (left channel). Reflections caught by those elements create stunning look of a luxury item.


    There are two compensation openings for dynamic driver — one is located on the inner part of the base, close to output nozzle and another one is at the bottom edge.


    R|L channel indicators and brand|model name are also located on the inner part of both bases. Those imprint are done by grinding which is much better than using paint which would eventually fade away.


    Output nozzles protruding from bases and have special retaining notches for exchangeable eartips.


    2pin, 0.78mm connectors don’t show any free play or rattling and have very tight fit for the incoming male pins.


    In overall, the design is minimalistic and clean. The quality of crafting and build is nothing more to be desired — everything is as perfect as it should be in IEMs of this price segment. The combination of polished and grinded stainless steel surfaces dedicate much to the attractive look.


    Both cables come with straight 3.5mm gold plated audio jack in aluminum housing, springy earguides, aluminum Y-splitters|limiters with brand name imprints, plastic housings of 2pin connectors and channel marks located there as well (red for right and blue for left). Audio cable for smartphones is also equipped with inline remote (volume +|- buttons) and mic. Packed in black silicone braid.


    Other cable for pure audio sources is thicker, has the extra quality feel and packed in transparent silicone braid.


    Fit comfort:

    As first, you might think that Oxygen should be heavy IEMs due to stainless steel shells. In fact, this choice of material is compensated by smaller size, thinner profile, very natural shape and good earguides. Shape and profile are similar to DARKSIDE model that has the excellent fit. Same here — Oxygen IEMs are easy to get used to and become almost insensible while put on. Another good outcome of this is more than the average noise isolation. No driver flex spotted either.



    Tested with Hidizs AP80, xDuoo X3 DAPs

    Lows and midbass:

    Perhaps, the best sound characteristics of Tanchjim Oxygen IEMs is the ability to accurately resolve and gently deliver the lower range. If DARKSIDE were kind of bass-heavy IEMs that built their nature upon this range, Oxygen is very delicate in this respect. Bass extension is still very good but more important is that its texturing and clarity is at much higher level. Bass can reach the lowest registers, maintains great clarity and not interferening or mixing with mids and treble. This range is not accented at all but always present and stays obvious to enrich the sound and widen the stage. Speed of decay is reasonably fast, contours are clearly defined. Great implementation and tuning for those who search for balanced lower range delivery.

    Midbass section is at the same high level — fast, powerful and tight. No shortage of air or articulation to reproduce drum sections naturally. In contrary to hybrid types of IEMs, the influence of treble is not as prominent resulting in more weight added to lower reverbs rather than higher ringing. This also defines Oxygen IEMs as tending towards darker tonality.


    Mids and vocals:

    The most of the resolution and accent is located at the mid section. Vocals are sounding rich, thick and take the leading role in the entire picture. No significant skeweness noticed between female and male voice gains. Both sound natural, lively and exposed, both have a touch of warmth. Of course, female vocals are bit more influenced by the lower treble but since it is coming from the dynamic driver — no excessive brightness or harsh sounds are present. Good resolution is observed on vocals and instruments of this range. Despite that some instruments are bit laid back in comparison to vocals — there are still plenty of details that actually reminds of some armature rivals with delicate tuning of mids. Sound of electric guitars as well as other instruments is full bodied with lots of natural harmonics. Another good characteristic is the impressive instrument separation that also adds much to the significant stage depth.



    Treble is perceived as clear and balanced to mids, sounding a bit more pronounced than lows. Extension, resolution and micro dynamics are outstanding for single dynamic driver IEMs but not as sparkling and vivid in comparison to armature models. The most presence and detalization is gathered in lower treble which adds the feel of transparency to the sound. This range is perfectly controlled, accurate and totally enough to balance bass or accented mids without puting much stress on your ears and allowing to have have long listening sessions. Of course, no piercing sounds, no extra sharpness produced by treble and no problems with hisses or sibilances as a result.



    As already mentioned — very capable IEMs concerning the the size of imaginary stage. Not afraid to say that Oxygen are leading now in this respect among all other dynamic models that ever got to our hands. Good instrument separation with significant spread in their position together with quite a wide space produced by lows and treble, plus the voices that are brought to front — all create a good feel of wide and deep stage.


    Sound in overall:

    Tanchjim Oxygen sound can be described as moderately dark and balanced, with slight accent on mids and vocals, great texturing of lows, good overall resolution, clear and natural voices and slightly warm timbre. Surprisingly good for any genre, including heavy metal and rap. Not the best choice for bass heads due to accurate and weighted delivery of this range instead of simply overemphasizing it.

    Compared to Earnine EN2J:


    The only IEMs that we’ve examined so far with the similar price tag — Earnine EN2J from South Korea. Many similarities between the two: shells made of stainless steel, small size, great fit. The main deifference is that Earnine EN2J belong to pure armature type of IEMs with better extenson of treble, more resolution in overall and better micro-dynamics. On the other hand — lacks in bass and midbass reproduction in comparison to Oxygen. EN2J does also sound quite warm, thanks to treble driver tuning, but still cannot compete in the extension of lows and richness of midbass range. Therefore, good opportunity to get the right model choosing from those two — either the more resolving and appealing lower end of Oxygen or better extension and higher clarity of treble of EN2J. But both sound pretty balanced when are not directly compared to each other.



    Two main definitions followed us while we were examining Tanchjim Oxigen IEMs and writing this review: accurate and clean. This addresses both — overall design and sound. There is nothing much to talk about or to admire in Oxygen appearance but at the same time such minimalistic approach, perfect crafting, clean look and natural profile represent the maturity of this model instead of incorporating screaming design to hide some drawbacks behind its exteriors. Sound quality and tuning spreads this idea further — accurate and weighted delivery of all frequency ranges resulting in balanced sound with slightly warmer tonality and wide soundstage. This is much better than having severe accents on either range to identify that IEMs are capable of only few genres. All in all, Tanchjim Oxygen do create a feel of fundamental and mature model regarding every single aspect and really impress with most of its sound characteristics. It would be hard to find any other match if the dynamic driver model is preferred.

    You can purchase Tanchjim Oxygen at PenonAudio store

    Video ad from Japan:

    1. View previous replies...
    2. guicnovaes
      I got very interested in this Tanchjim, also on the Hidizs MS4, after saw your Kanas Pro review. How do you compare The Oxygen and the Hidizs MS4 in terms of sound quality? By hearing, do you think that the Oxygen or the MS4 follows the Harman Target Curve, just like the Kanas Pro? Thanks in Advance.
      guicnovaes, Feb 25, 2019
    3. HiFlight
      I prefer the fit and SQ of the Oxygen over that of my KPE. It just has a more likelike presentation with superb imaging and depth. I have not heard the MS4 but I have found very few IEM's over the many years that I have been involved with this hobby that have impressed me as much as the O2.
      HiFlight, Feb 25, 2019
    4. mgunin
      @HiFlight would you compare it favourably to Moondrop Kanas Pro and Periodic Be?
      mgunin, Apr 3, 2019


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