Short answer: a tie on sound quality. Both are rated 4.0/5 (#418 and #393 of 1291 in-ear headphones) at nearly the same price ($55 vs $52), so choose on features and fit.
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 catch: Presence sits about 3.6 dB low with a 7.5 dB dip near 6.3 kHz, so vocals and instruments lose some bite.
Why pick the TANGZU YuXuanJi: The median of 14 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.14 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. Watch for: Presence sits about 4.2 dB low with a 5.2 dB dip near 5.3 kHz, so vocals and instruments lose some bite.
Buy the Cozoy D2 or the TANGZU YuXuanJi on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
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 eBay
The median of 14 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.14 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural.
Amazon $52.00 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
| Cozoy D2 | TANGZU YuXuanJi | |
|---|---|---|
| Price | $55 | $52.00 |
| Ranked | #418 of 1291 in In-Ear Headphones | #393 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x 6mm dynamic | 1 x 10mm dynamic |
| Impedance | 20 ohms | 15.6 ohms |
| Frequency Response | 10Hz - 50kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 74 (median of 16 squig.link measurements, calibrated to AutoEQ) | 74 (median of 14 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.11 dB standard deviation | 2.14 dB standard deviation |
| Tonal Tilt | -0.09 (negative is warmer, positive brighter) | -0.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.9 dB at 30 Hz) |
| Sensitivity | - | 104.5 dB |
| Built-in Microphone | - | No |
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 Cozoy D2 from aftersound, ankramutt, audioamigo, bassaudio, digaoreviews, ducbloke, elrics, fahryst, fernandagunsan, hbb, jaytiss, musicafe, practiphile, soundcheck39, superreview and tonedeafmonk; the TANGZU YuXuanJi from aden, audioamigo, csi-zone, eplv, faxepremium, hu-fi, isaiahse, jaytiss, koi, lown-fi, lumerion, obodio, sl0the and soundignity, all via squig.link.
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