Short answer: the Letshuoer D02. It ranks #407 of 1291 in-ear headphones by sound quality, rated 4.0/5, at $26.99; the KZ ZSN Pro ranks #466, rated 3.9/5, at $25.99. Close enough in price that the sound-quality gap is the deciding factor.
What the Letshuoer D02 does well: The median of 7 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.01 dB spread. The catch: Sub-bass is 3.4 dB short at 30 Hz, so deep bass lacks rumble.
The case for the KZ ZSN Pro: A preference score of 73 in HypetheSonics’ measurement is solid for a wired set this cheap, with a response that stays within about 2.2 dB of the Harman target. Watch for: Treble above 10 kHz runs about 6 dB hot, with a sharp 9.4 dB peak near 11 kHz that can make cymbals and hi-hats sound glassy or hissy.
Buy the Letshuoer D02. It is rated higher for sound quality, and saving $1 with the KZ ZSN Pro does not make up for the sound-quality gap.
Still deciding? The full Headphones rankings cover every ranked option.
The median of 7 hobbyist measurements gives it a solid Harman preference score of 74 with a 2.01 dB spread.
Letshuoer $26.99 eBay
A preference score of 73 in HypetheSonics’ measurement is solid for a wired set this cheap, with a response that stays within about 2.2 dB of the Harman target.
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Specifications Side By Side
| Letshuoer D02 | KZ ZSN Pro | |
|---|---|---|
| Price | $26.99 | $25.99 |
| Ranked | #407 of 1291 in In-Ear Headphones | #466 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 74 (median of 7 squig.link measurements, calibrated to AutoEQ) | 73 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 2.01 dB standard deviation | 2.23 dB standard deviation |
| Tonal Tilt | +0.33 (negative is warmer, positive brighter) | -0.11 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 11mm dynamic | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | 26 ohms | 25 ohms |
| Sensitivity | 108 dB | 104 dB/mW |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 40kHz (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 Letshuoer D02 from audioamigo, awsmdanny, hu-fi, jaytiss, kazi, practiphile and tonedeafmonk; the KZ ZSN Pro from achoreviews, aden, aftersound, ankramutt, eplv, hoods, isaiahse, lown-fi, melatonin, pw and superreview, all via squig.link.
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