240 €

Review published:




per Side






32 Ohm











110 dB








Daily Life


10 - 40000 Hz


Am I an audiophile? I think that's in the eye of the beholder and depends mainly on who I compare myself with. Compared to my girlfriend, I am audiophile to the power of 10, because she is happy if music sounds out of her headphones at all, no matter in which way. Of course, I assume here that there is simply no comparison and, moreover, no will to classify what is heard in terms of sound. If I now compare myself with someone who is always striving to take his audio pleasure into new spheres through constant expansions, detailed adjustments and connections, which is usually accompanied by record-breaking sums of money, then I am again small with a hat on. Likewise, I wouldn't claim to have particularly analytical ears, but a broader musical understanding and the gift of being able to identify and compare even subtle differences.

What am I getting at? The HARMAN curve reflects, among other things, an "ideal" signature, which is supposed to do justice to the majority of the music consuming population, so it can be called mainstream.
So am I a mainstream consumer when it comes to sound reproduction? I think so and I stand by it. What distinguishes me, however, is the fact that I look beyond my own nose, what still exists and what might broaden my preferences, or even change/adapt them.
According to this, the TANCHJIM OXYGEN should be the jackpot for me, but
did he really?


A bit the QXYGEN reminds me of some 64 AUDIO models, concerning the rough shape. I like this simple design very much, also in terms of comfort.
The IEM name engraved on the full metal case (left) and the company logo (right) are of course a matter of taste, but I like this design. Apart from that, the faceplate is ground and therefore matt, only the engravings are "polished" and therefore stand out. The OXYGEN is also available in black.

As far as the workmanship is concerned, TANCHJIM cannot be blamed at all. Valuable, robust, stylish and above all focused more on the usability than on abstract ear warmers.

The scope of delivery is quite lavish, with a selection of silicone tips, two 2-pin cables (copper and silver, I like the silver one better haptically, but it doesn't have a micro), a hardcase and a golden small plate with the company logo. The whole thing comes in a nice square package.

The isolation is ok, but it needs music to be able to really isolate yourself from the outside world.


The good Mr. HARMAN has added his mustard here and so well that I would say that the OXYGEN hits the curve except for slight deviations and to the same extent, as for example the Moondrop KXXS, or STARFIELD, as well as the KANAS PRO, which was my favorite single dynamic IEM with Harman style until now. Was, because the OXYGEN is for me one more small upgrade and has conquered my HARMAN-infested heart.
So, enough with HARMAN, because even if I would call myself a mainstreamer, I don't agree 100% with the curve (which is always adjusted)

Let's get straight to what the OXYGEN does really well and that is the bass. Plenty of sub-bass level without neglecting the mid-bass, respectively there is a slight focus, which is a bit contradictory to HARMAN. In the upper bass it drops a bit, with a smooth transition to the midrange. The bass has punch, body and is also noticeable when the track delivers it. Due to the choice of drivers the dynamics are also a clear advantage and one never has the feeling that there is a lack of bass, but also not that it is too much. Just right for me, to the point and naturally. Subjectively, I find hardly any tonal errors in this area and also overall with the OXYGEN. The bass doesn't steal anyone's thunder, but doesn't put itself under a bushel either, but it could create a bit more pressure.

When talking about the HARMAN curve, the somewhat brighter tuning in the mids and also the accentuation of some instruments and partly the voices are sometimes "criticized", which can become unpleasant in the worst case. Well, the OXYGEN can't be denied this, but the question is also how the driver handles it technically and I find that this bothers me much more, for example with the STARFIELD. The OXYGEN gets by with the same signature with less negative hardness and sounds more relaxed, despite the same tuning. I find voices on the OXYGEN absolutely correct in tone, even if they can seldom be a bit demanding. Here one should have the volume in mind.
The voices are placed in front of the mix, but in the panorama they are wonderfully enclosed by the instruments, with a realistic separation. The mids manage to combine lightness, volume and naturalness with a slight bright alignment, which makes the OXYGEN appear very airy and spatial. This all sounds very positive, but through the Pink Glasses I can still see the somewhat too researched upper mids and I would like to exchange some of the relaxedness for a little more assertiveness of the lower mids.

The highs are very resolving and transparent, but can tolerate and forgive weaker sources without losing detail and naturalness. Nevertheless, I'd like to go a bit more directly to the point here, even though I appreciate the smooth but competent manner just as much. I think in the high frequencies most minds are divided and it is always difficult to make everyone happy. Before I have to take the in-ear out again after 5 minutes with an earache, but I can imagine that I've heard every micro detail, I prefer to swim in more relaxed waters and accept a couple of deductions. Please don't stone me now, I am also aware through my own experiences that a high resolution high tone is not immediately accompanied by earache and migraine, but here one quickly finds oneself in a completely different price range. The highs perform extremely well for their class, don't hide anything and surprise you with fine micro details every now and then.

Concerning imaging I am really impressed. Everything seems to harmonise perfectly and to build up on top of each other, side by side and one behind the other, with enough space in between to easily locate and focus on even single details.


The OXYGEN is the first IEM I was allowed to hear from TANCHJIM and even though I approached the sound with many expectations through the tuning I had heard before, I was not disappointed despite the weaknesses I was just as aware of.
Now, what would I miss to my happiness if we took the HARMAN curve as a reference? Well, maybe a bit more warmth, fuller lower and tamed upper mids, and a My more definition in the trebles. But these are my own preferences and also when it comes to OXYGEN grumbling on a high level. Who loves the HARMAN CURE will also love the OXYGEN and with it you get one of the best single dynamic IEMs with this signature on the market.
Even though TANCHJIM is a bit higher priced than MOONDROP with their comparable models, I think that with the OXYGEN you get a small but nice upgrade in terms of sound and technology. I guess at school you would have been scratched close to 1- with the OXYGEN, but in the end you'll be happy to get a well-deserved 2+ in terms of sound!

Thanks to OARDIO for the review unit.



Here the processing plays a role and the usability of the scope of supply. Additionally the appearance, wearing comfort and robustness.

Here I evaluate for me subjectively the price/performance ratio - does not flow into the evaluation!

Z: No Brainer

A: money well spent

B: all right, you can do

C: gives better for less money

D: overpriced

E: collector's price

Daily life:
Here, I focus on the long-term audibility and whether I can hear it well out of the box. This is of course very subjective and therefore only a minimal deduction or bonus. 

(-0.1, 0, +0.1)


Rating in Letters

S: 9.5 - 10

A: 9.0 - 9.4​

B: 8.0 - 8.9​

C: 7.0 - 7.9

D: 6.0 - 6.9​
E: 5.0 - 5.9​

F: 0.0 - 4.9​




Second Opinion:


CHI-FIEAR © 2020 by David Hahn

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