Short answer: the Tanchjim Ola II. It ranks #900 of 1369 in-ear headphones by sound quality, rated 3.4/5, at $6.99; the FiiO x JadeAudio JD1 ranks #943, rated 3.3/5, and costs $29.90, so there is not much of a tradeoff to weigh.
What the Tanchjim Ola II does well: A broadly balanced tuning with a preference score of 66 against the Harman target. The tradeoff: An uneven response, 2.6 dB standard deviation from target.
The case for the FiiO x JadeAudio JD1: A broadly balanced tuning with a preference score of 65 against the Harman target. Watch for: An uneven response, 2.4 dB standard deviation from target.
Buy the Tanchjim Ola II. It is rated higher for sound quality than the FiiO x JadeAudio JD1 and costs less, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 66 against the Harman target.
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A broadly balanced tuning with a preference score of 65 against the Harman target.
Amazon $29.90 eBayPrices on this page were last checked October 17, 2026 at 6:04 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
| Tanchjim Ola II | FiiO x JadeAudio JD1 | |
|---|---|---|
| Price | 6.99 | $29.90 |
| Ranked | #900 of 1369 in In-Ear Headphones | #943 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 66 (median of 6 squig.link measurements, calibrated to AutoEQ) | 65 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.58 dB standard deviation | 2.37 dB standard deviation |
| Tonal Tilt | -0.35 (negative is warmer, positive brighter) | -0.72 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.9 dB at 30 Hz) |
| Driver Type | Hybrid | Dynamic |
| Drivers | 1 dynamic driver + 1 balanced armature (10mm DMT5 dynamic + PURE Hi balanced armature) | 1 x 10mm LCP (Liquid Crystal Polymer) dynamic driver |
| Impedance | 30 ohms | 24 ohms |
| Sensitivity | 121 dB/Vrms | 109 dB/mW |
| Frequency Response | 8Hz - 48kHz | 20Hz - 20,000Hz |
| Weight | 0 lbs (5 g) | 0 lbs (7 g) (per earpiece) |
| Connection | Wired | Wired |
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 Tanchjim Ola II from aftersound, atechreviews, audioamigo, csi-zone, samreviews and soundignity; the FiiO x JadeAudio JD1 from boizoff, dchpgall, ianfann and jaytiss, all via squig.link.
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