Short answer: the KBEAR KB03. It ranks #327 of 1291 in-ear headphones by sound quality, rated 4.1/5, at $54.99; the Cozoy D2 ranks #418, rated 4.0/5, and costs $55, so there is not much of a tradeoff to weigh.
What the KBEAR KB03 does well: The median of 6 hobbyist measurements gives it a very good Harman preference score of 75 with a 1.77 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. The tradeoff: A 4.6 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
The case for the Cozoy D2: The median of 16 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.11 dB spread, and its mids sit within about 0.7 dB of target, so vocals and instruments sound natural. The tradeoff: Presence sits about 3.6 dB low with a 7.5 dB dip near 6.3 kHz, so vocals and instruments lose some bite.
Buy the KBEAR KB03. It is rated higher for sound quality than the Cozoy D2 and costs less, which makes it the one to get unless you need something the other one does better.
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The median of 6 hobbyist measurements gives it a very good Harman preference score of 75 with a 1.77 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural.
Amazon $54.99 eBay
The median of 16 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.11 dB spread, and its mids sit within about 0.7 dB of target, so vocals and instruments sound natural.
Cozoy $55 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
| KBEAR KB03 | Cozoy D2 | |
|---|---|---|
| Price | $54.99 | $55 |
| Ranked | #327 of 1291 in In-Ear Headphones | #418 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 75 (median of 6 squig.link measurements, calibrated to AutoEQ) | 74 (median of 16 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.77 dB standard deviation | 2.11 dB standard deviation |
| Tonal Tilt | -0.51 (negative is warmer, positive brighter) | -0.09 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.9 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature + 1 bone conduction) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 1 x 10mm bone conduction | 1 x 10mm dynamic + 1 x 6mm dynamic |
| Impedance | 9.4 ohms | 20 ohms |
| Sensitivity | 101 dB/mW | - |
| Frequency Response | - | 10Hz - 50kHz (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 KBEAR KB03 from audioamigo, ducbloke, eplv, jaytiss, pw and tonedeafmonk; the Cozoy D2 from aftersound, ankramutt, audioamigo, bassaudio, digaoreviews, ducbloke, elrics, fahryst, fernandagunsan, hbb, jaytiss, musicafe, practiphile, soundcheck39, superreview and tonedeafmonk, all via squig.link.
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