Short answer: the KZ Libra. It ranks #901 of 1369 in-ear headphones by sound quality, rated 3.4/5, at $2; 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 KZ Libra does well: A broadly balanced tuning with a preference score of 66 against the Harman target. The tradeoff: An uneven response, 2.3 dB standard deviation from target.
What the FiiO x JadeAudio JD1 does well: A broadly balanced tuning with a preference score of 65 against the Harman target. The catch: An uneven response, 2.4 dB standard deviation from target.
Buy the KZ Libra. 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.
Looking for alternatives? See the complete Headphones rankings.
A broadly balanced tuning with a preference score of 66 against the Harman target.
KZ Audio eBay
A broadly balanced tuning with a preference score of 65 against the Harman target.
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Specifications Side By Side
| KZ Libra | FiiO x JadeAudio JD1 | |
|---|---|---|
| Price | 2.00 | $29.90 |
| Ranked | #901 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 4 squig.link measurements, calibrated to AutoEQ) | 65 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.28 dB standard deviation | 2.37 dB standard deviation |
| Tonal Tilt | -0.86 (negative is warmer, positive brighter) | -0.72 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.9 dB at 30 Hz) |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm ultra-wideband dynamic driver | 1 x 10mm LCP (Liquid Crystal Polymer) dynamic driver |
| Impedance | 25 ohms | 24 ohms |
| Sensitivity | 108 dB | 109 dB/mW |
| Frequency Response | 20Hz - 40kHz | 20Hz - 20,000Hz |
| Connection | Wired | Wired |
| Weight | - | 0 lbs (7 g) (per earpiece) |
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 KZ Libra from boizoff, eplv, obodio, soundcheck39, theaudiostore and treblewellxtended; the FiiO x JadeAudio JD1 from boizoff, dchpgall, ianfann and jaytiss, all via squig.link.
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