Short answer: the Kotori Audio Zephyr. Both are rated 3.2/5 for sound quality (#994 and #1014 of 1369 in-ear headphones), and the Kotori Audio Zephyr costs $50 against $58 for the ZiSin 340, and with sound quality even, the cheaper one is the better buy.
Why pick the Kotori Audio Zephyr: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap. The catch: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Why pick the ZiSin 340: About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end. The tradeoff: An uneven response, 2.5 dB standard deviation from target.
Buy the Kotori Audio Zephyr. Both are rated the same for sound quality, and it costs $8 less than the ZiSin 340.
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A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
Kotori Audio eBay
About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
AliExpress $58.00 eBayPrices on this page were last checked October 17, 2026 at 6:04 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
| Kotori Audio Zephyr | ZiSin 340 | |
|---|---|---|
| Price | 50.00 | $58.00 |
| Ranked | #994 of 1369 in In-Ear Headphones | #1014 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 64 (median of 4 squig.link measurements, calibrated to AutoEQ) | 63 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.92 dB standard deviation | 2.54 dB standard deviation |
| Tonal Tilt | -0.25 (negative is warmer, positive brighter) | -0.90 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.2 dB at 30 Hz) |
| Driver Type | Hybrid | Dynamic |
| Drivers | 1 dynamic driver + 1 balanced armature (10mm titanium dynamic driver + Knowles balanced armature) | 1 x 10mm dynamic driver (dual-cavity gold-plated composite film) |
| Impedance | 18.3 ohms | 32 ohms |
| Sensitivity | 92.6 dB SPL | 123 dB/Vrms |
| Frequency Response | 20Hz - 20kHz | 10Hz - 26kHz |
| Weight | 0 lbs (5.2 g) | - |
| Connection | Wired | Wired |
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 Kotori Audio Zephyr from elrics, obodio, tonedeafmonk and treblewellxtended; the ZiSin 340 from audioamigo, ducbloke, jaytiss and soundcheck39, all via squig.link.
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