Short answer: the Acoustune HS1300SS. It ranks #309 of 1291 in-ear headphones by sound quality, rated 4.2/5, at $199; the IKKO OH10S ranks #337, rated 4.1/5, at $199. Close enough in price that the sound-quality gap is the deciding factor.
The case for the Acoustune HS1300SS: A broadly balanced tuning with a preference score of 76 against the Harman target. Watch for: An uneven response, 2.0 dB standard deviation from target.
Why pick the IKKO OH10S: The median of 4 hobbyist measurements gives it a very good Harman preference score of 75 with a 1.71 dB spread, and its mids sit within about 0.7 dB of target, so vocals and instruments sound natural. The catch: A 5.7 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
Buy the Acoustune HS1300SS. It is rated higher for sound quality than the IKKO OH10S at the same price, so only choose the other one for a particular feature it does better.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 76 against the Harman target.
Zeppelin & Co eBay
The median of 4 hobbyist measurements gives it a very good Harman preference score of 75 with a 1.71 dB spread, and its mids sit within about 0.7 dB of target, so vocals and instruments sound natural.
IKKO $199.00 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Acoustune HS1300SS | IKKO OH10S | |
|---|---|---|
| Price | $199 | $199.00 |
| Ranked | #309 of 1291 in In-Ear Headphones | #337 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 76 (median of 4 squig.link measurements, calibrated to AutoEQ) | 75 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.00 dB standard deviation | 1.71 dB standard deviation |
| Tonal Tilt | +0.02 (negative is warmer, positive brighter) | -0.49 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x dynamic (Myrinx) | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | - | 18 ohms |
| Sensitivity | - | 106 dB |
| Frequency Response | - | 20Hz - 40kHz (Manufacturer specified) |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the Acoustune HS1300SS from aden, banzai1122, dchpgall and hu-fi; the IKKO OH10S from ianfann, iemworld, soundcheck39 and timmyv, all via squig.link.
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