125 €

Review published:




per Side






18 Ohm











106 dB








Daily Life


20 - 40000 Hz


The IKKO OH1 opens the colourful hustle and bustle of my new category "High-Class" and is therefore the first IEM I can review, which costs over 100€ and the upcoming in-ears in the segment, such as the Moondrop Kanas Pro, or the Accutone Studio 1, have to measure themselves against.


The OH1 may not have such a pompous packaging as the 1More E1010, but it contains everything it needs. A sleek cloth bag, 6 pairs of silicone tips (Balanced and Vocal), where there's not so much difference (the Vocaltips sound a bit more open than the balanced ones) and a decent 4-core cable with MMCX connector. However, this could be a bit more solid and there is unfortunately no remote/micro available as an option.

The OH1 looks a bit like a molar from the side with a diamond relief. They are made of full metal and quite narrow in shape. They sit comfortably, ergonomically and offer a safe hold, at least as far as I am concerned. The two sides are clearly marked with left and right, but I am of the opinion that it is irrelevant for IEMs, because theoretically there is usually only one way to wear them so that it feels right. This is a bit more important for cables, where a coloured marking is used.

The isolation is really good, very good even in the context of passive isolation! With the right tips, you can almost completely isolate yourself from the outside world and also this is not sounded.


Despite its great appearance, workmanship and wearing comfort, the sound is the heart of the OH1.

The bass is indeed one of the most controlled and detailed I've ever heard. It plays low without rolling off too early and shows an almost linear sound even in the mid bass from the hearing sensation. The sub-bass is more accentuated compared to the higher lows, but this is exactly what I like and appreciate musically. I find the same in the Kanas Pro as well, although the emphasis is even stronger compared to the midbass. However, the OH1 can generate more pressure and in good German it simply smashes more in the bass. The bass is definitely one of the strongest features of the OH1 and presents itself fast, natural and accurate with detailed bass lines. As the name suggests, the dynamic driver also provides the necessary dynamics to guarantee a perfect listening experience for me, which isn't always the case with pure BA configurations, whether or not I have to admit that I wasn't allowed to hear a pure BA configuration permanently in the price range. Here I must fall back on the KZ AS10, or AS06.

Thanks to its finely tuned, fast and precise action, the bass never slips into the midrange. They can unfold their full potential without any problems. Here the BA driver takes over seamlessly and elegantly. The mids are convincing with clarity and bursting with energy. This vitality is what makes the mids stand out in the overall sound image. They are positioned a bit behind the bass and treble in the lower mid-range, but they are more forward in the higher range, which is also one of my preferences. In addition, they resolve really impressively. No matter what you give them, they can reproduce it naturally and true to detail and position it correctly in the room. They are not hard, but soft and harmoniously reproduce the sounds. Nevertheless, the BA driver can be heard here from time to time, which doesn't make the mids appear thin at all, but also not as powerful as some dynamic drivers. Due to the solid body of the lower mids and the rise in the upper range, men and women's voices present themselves with natural sound and typical characteristics.

The highs live in perfect symbiosis with the mids and lows. This means that there are no fatiguing peaks and they still play up and down tirelessly. They don't have the biggest extension, but they sound very natural without being overly analytical and sharp. Maybe too little for some high fanatics, but just right for me. Nevertheless, they have an impressive wealth of details and provide a clear and airy sound.
The OH1 can reveal the smallest details and make them locatable. The highs are just as convincing as the rest and make the OH1 a really round, exciting listening pleasure!
Did I just say tireless? Not quite and that is a small point of criticism. With fast rock music, or generally music with exuberant and multiplied, fast following, treble-heavy parts of instruments/sounds, the BA driver seems somewhat stressed. This means that it doesn't follow quite so playfully anymore and slightly compresses the content around the top. That doesn't mean at all that such music styles are taboo, but you should be aware that you might have to reckon with some compromises. Here, for example, the Kanas Pro (single-DD) presents itself more mature. This is of course a high standard, because many budget IEMs have this problem much stronger, but paying that much money you can be more critical, at least that's my approach.

The OH1 shows no weakness in image and stage. One could wish for a little more depth, but what is happening on a broad scale is already remarkable. Clear separation of instruments, enormous transparency, no feeling of tightness (spatially) and above all no overlapping sound goulash. Great!


With the OH1, IKKO publishes a first work that has a lot to offer. If they can maintain this level and possibly even top it, for example with a 3-way system, which makes the highs appear clean even under high stress, we can be more than excited. The OH1 will increase its popularity without a doubt quickly and rightly and will probably make many audio enthusiasts happy in the future.




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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