Short answer: a tie on sound quality. Both are rated 4.9/5 (#25 and #17 of 1291 in-ear headphones) at nearly the same price ($35.89 vs $39.99), so choose on features and fit.
What the Cozoy D1 does well: The median of 26 hobbyist measurements gives it an excellent Harman preference score of 84 with a 1.14 dB spread, and its mids sit within about 1.1 dB of target, so vocals and instruments sound natural. The tradeoff: A 4.3 dB peak near 11.2 kHz can make cymbals and sibilance sound sharp.
Why pick the EPZ Q1 Pro: For a budget single dynamic in-ear, the median of 29 hobbyist measurements is impressive: a preference score of 85 and an average deviation of about 1 dB from the Harman target. Watch for: Sub-bass sits about 1.6 dB under target, so deep electronic bass has slightly less rumble than bass fans may want.
Buy the Cozoy D1 or the EPZ Q1 Pro on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
The median of 26 hobbyist measurements gives it an excellent Harman preference score of 84 with a 1.14 dB spread, and its mids sit within about 1.1 dB of target, so vocals and instruments sound natural.
AliExpress $35.89 eBay
For a budget single dynamic in-ear, the median of 29 hobbyist measurements is impressive: a preference score of 85 and an average deviation of about 1 dB from the Harman target.
Amazon $39.99 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 D1 | EPZ Q1 Pro | |
|---|---|---|
| Price | $35.89 | $39.99 |
| Ranked | #25 of 1291 in In-Ear Headphones | #17 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 10mm dynamic |
| Impedance | 32 ohms | 32 ohms |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 84 (median of 26 squig.link measurements, calibrated to AutoEQ) | 85 (median of 29 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.14 dB standard deviation | 1.05 dB standard deviation |
| Tonal Tilt | -0.06 (negative is warmer, positive brighter) | +0.17 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.2 dB at 30 Hz) |
| Sensitivity | - | 100 dB/Vrms |
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 D1 from aftersound, ankramutt, audioamigo, awsmdanny, bassaudio, digaoreviews, dl, ducbloke, elrics, fahryst, fernandagunsan, hbb, hobbytalk, jaytiss, lumerion, musicafe, practiphile, pw, silicagel, sl0the, soundcheck39, soundignity, superreview, suporsalad, theaudiostore and tonedeafmonk; the EPZ Q1 Pro from aftersound, ankramutt, audioamigo, digaoreviews, dl, ducbloke, fahryst, hobbytalk, ianfann, iemworld, jaytiss, koi, kuping-sensi, lumerion, mmagtech, musicafe, obodio, practiphile, pw, regancipher, riz, soundcheck39, soundignity, superreview, suporsalad, theaudiostore, tonedeafmonk, treblewellxtended and vortexreviews, all via squig.link.
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