Short answer: a tie on sound quality. Both are rated 4.9/5 (#25 and #7 of 1291 in-ear headphones) at nearly the same price ($35.89 vs $34.99), so choose on features and fit.
The case for the Cozoy D1: 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 catch: A 4.3 dB peak near 11.2 kHz can make cymbals and sibilance sound sharp.
The case for the Intuaura Reference 2019: In the median of five hobbyist measurements on squig.link, the Reference 2019 posts a preference score of 87 with under 1 dB of unevenness, among the most accurate in-ears measured. The tradeoff: Treble runs a bit lively, with a 5.8 dB peak near 8 kHz and the air band about 2.3 dB high, so bright recordings can sound sharp.
Buy the Cozoy D1 or the Intuaura Reference 2019 on features: they are rated the same for sound quality at close to the same price.
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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
In the median of five hobbyist measurements on squig.link, the Reference 2019 posts a preference score of 87 with under 1 dB of unevenness, among the most accurate in-ears measured.
Amazon $34.99 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 | Intuaura Reference 2019 | |
|---|---|---|
| Price | $35.89 | $34.99 |
| Ranked | #25 of 1291 in In-Ear Headphones | #7 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) | 5Hz - 22kHz (Manufacturer specified) |
| Harman Preference Score | 84 (median of 26 squig.link measurements, calibrated to AutoEQ) | 87 (median of 5 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.14 dB standard deviation | 0.95 dB standard deviation |
| Tonal Tilt | -0.06 (negative is warmer, positive brighter) | -0.04 (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 (+1.4 dB at 30 Hz) |
| Sensitivity | - | 105 dB/Vrms |
| 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 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 Intuaura Reference 2019 from boizoff, cqtek, obodio, pw and treblewellxtended, all via squig.link.
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