Short answer: the KZ Libra. It ranks #901 of 1369 in-ear headphones by sound quality, rated 3.4/5, at $2; the CCZ BC02 ranks #1036, rated 3.1/5, at $2. Close enough in price that the sound-quality gap is the deciding factor.
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.
The case for the CCZ BC02: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap. The catch: An uneven response, 2.7 dB standard deviation from target.
Buy the KZ Libra. It is rated higher for sound quality than the CCZ BC02 at the same price, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Headphones rankings.
A broadly balanced tuning with a preference score of 66 against the Harman target.
KZ Audio eBay
A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
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Specifications Side By Side
| KZ Libra | CCZ BC02 | |
|---|---|---|
| Price | 2.00 | 2.00 |
| Ranked | #901 of 1369 in In-Ear Headphones | #1036 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) | 63 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.28 dB standard deviation | 2.72 dB standard deviation |
| Tonal Tilt | -0.86 (negative is warmer, positive brighter) | -0.58 (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 (+1.2 dB at 30 Hz) |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm ultra-wideband dynamic driver | 1 x 10mm dynamic driver (CNT diaphragm) |
| Impedance | 25 ohms | 18 ohms |
| Sensitivity | 108 dB | 108 dB |
| Frequency Response | 20Hz - 40kHz | 20Hz - 20kHz |
| Connection | Wired | Wired |
| Weight | - | 0 lbs (4 g) (per earbud) |
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 CCZ BC02 from eplv, pw and tdl, all via squig.link.
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