Short answer: the HeartField Blanc. It ranks #957 of 1369 in-ear headphones by sound quality, rated 3.3/5, at $49; the Kotori Audio Zephyr ranks #994, rated 3.2/5, and costs $50, which makes this an easy call rather than a real tradeoff.
What the HeartField Blanc does well: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap. Watch for: An uneven response, 2.8 dB standard deviation from target.
The case for 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 tradeoff: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the HeartField Blanc. It is rated higher for sound quality than the Kotori Audio Zephyr and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
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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.
Linsoul eBay
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 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
| HeartField Blanc | Kotori Audio Zephyr | |
|---|---|---|
| Price | 49.00 | 50.00 |
| Ranked | #957 of 1369 in In-Ear Headphones | #994 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 65 (median of 3 squig.link measurements, calibrated to AutoEQ) | 64 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.83 dB standard deviation | 2.92 dB standard deviation |
| Tonal Tilt | +0.22 (negative is warmer, positive brighter) | -0.25 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-4.5 dB at 30 Hz) |
| Driver Type | Balanced Armature | Hybrid |
| Drivers | 5 balanced armature drivers per side | 1 dynamic driver + 1 balanced armature (10mm titanium dynamic driver + Knowles balanced armature) |
| Impedance | 15 ohms | 18.3 ohms |
| Connection | Wired | Wired |
| Sensitivity | - | 92.6 dB SPL |
| Frequency Response | - | 20Hz - 20kHz |
| Weight | - | 0 lbs (5.2 g) |
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 HeartField Blanc from dl, gadgetrytech, jaytiss and silicagel; the Kotori Audio Zephyr from elrics, obodio, tonedeafmonk and treblewellxtended, all via squig.link.
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