The Kotori Audio Zephyr ranks #994 out of 1369 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Prices 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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#994 Kotori Audio Zephyr: 50.00 Kotori Audio eBay
Pros: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
Cons: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones. An uneven response, 2.9 dB standard deviation from target.
Is the Kotori Audio Zephyr right for you?
Buy it if
- you are sensitive to bright or sharp treble (treble sits 4.0 dB below target).
- you are happy to use EQ: our preset lifts its Harman match by about 20 points.
Skip it if
- you want the best value: the higher-rated EPZ G10 costs about $26 less.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.92 dB standard deviation |
| Driver Type | Hybrid |
| Drivers | 1 dynamic driver + 1 balanced armature (10mm titanium dynamic driver + Knowles balanced armature) |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz |
| Harman Preference Score | 64 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 18.3 ohms |
| Sensitivity | 92.6 dB SPL |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.5 dB at 30 Hz) |
| Tonal Tilt | -0.25 (negative is warmer, positive brighter) |
| Weight | 0 lbs (5.2 g) |
EQ Presets
Harman target
Set a preamp of -6.6 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 84 out of 100, up from 64.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +3.5 dB | 0.70 |
| Peak | 198 Hz | -2.9 dB | 0.64 |
| Peak | 1,453 Hz | -2.4 dB | 3.03 |
| Peak | 2,740 Hz | +3.9 dB | 3.83 |
| Peak | 5,345 Hz | +4.0 dB | 0.42 |
| Peak | 7,644 Hz | -1.8 dB | 2.34 |
Neutral target
Set a preamp of -6.2 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 86 out of 100, up from 43.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -5.1 dB | 0.70 |
| Peak | 198 Hz | -2.9 dB | 0.60 |
| Peak | 1,491 Hz | -2.1 dB | 3.61 |
| Peak | 2,440 Hz | +1.5 dB | 5.97 |
| Peak | 2,954 Hz | +6.0 dB | 1.40 |
| Peak | 4,491 Hz | -2.0 dB | 6.00 |
| Peak | 5,816 Hz | +5.4 dB | 6.00 |
Studio flat target
Set a preamp of -6.2 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 84 out of 100, up from 23.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -7.7 dB | 0.70 |
| High shelf | 10,000 Hz | +1.9 dB | 0.70 |
| Peak | 181 Hz | -4.8 dB | 0.70 |
| Peak | 1,489 Hz | -2.1 dB | 3.00 |
| Peak | 2,603 Hz | +6.0 dB | 1.48 |
| Peak | 3,482 Hz | +2.8 dB | 6.00 |
| Peak | 5,853 Hz | +5.3 dB | 6.00 |
Warm target
Set a preamp of -6.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 85 out of 100, up from 70.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +3.7 dB | 0.70 |
| High shelf | 10,000 Hz | -3.6 dB | 0.70 |
| Peak | 198 Hz | -2.7 dB | 0.70 |
| Peak | 1,497 Hz | -2.5 dB | 3.22 |
| Peak | 2,839 Hz | +4.6 dB | 4.44 |
| Peak | 5,345 Hz | +3.0 dB | 0.40 |
| Peak | 7,958 Hz | -0.9 dB | 0.57 |
Bass target
Set a preamp of -6.6 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 83 out of 100, up from 56.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.8 dB | 0.70 |
| Peak | 210 Hz | -2.8 dB | 0.88 |
| Peak | 1,442 Hz | -2.4 dB | 2.81 |
| Peak | 2,740 Hz | +3.9 dB | 3.83 |
| Peak | 5,345 Hz | +4.0 dB | 0.42 |
| Peak | 7,644 Hz | -1.8 dB | 2.33 |
Bright target
Set a preamp of -6.6 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 78 out of 100, up from 30.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -5.1 dB | 0.70 |
| High shelf | 10,000 Hz | +1.7 dB | 0.70 |
| Peak | 198 Hz | -2.9 dB | 0.53 |
| Peak | 620 Hz | +1.0 dB | 1.68 |
| Peak | 1,547 Hz | -2.8 dB | 2.80 |
| Peak | 2,773 Hz | +6.0 dB | 1.14 |
| Peak | 3,673 Hz | +1.8 dB | 6.00 |
| Peak | 5,590 Hz | +5.0 dB | 3.96 |
V-shaped target
Set a preamp of -6.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 76 out of 100, up from 53.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.9 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 213 Hz | -1.5 dB | 1.49 |
| Peak | 1,428 Hz | -3.1 dB | 2.07 |
| Peak | 2,773 Hz | +6.0 dB | 1.06 |
| Peak | 3,716 Hz | +1.7 dB | 6.00 |
| Peak | 5,535 Hz | +4.7 dB | 3.65 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the Kotori Audio Zephyr measures across the audible range, against the Harman in-ear target that most listeners prefer in blind tests. Where the line sits above the target that range sounds louder (more bass, brighter treble), below it quieter. The curve is the median of 4 independent measurements, so one odd sample or rig cannot skew it, and both lines are shifted so their 500 Hz to 2 kHz average sits at 0 dB.
Measurement data: median of 4 measurements from the squig.link databases of elrics, obodio, tonedeafmonk and treblewellxtended. Thanks to each of them for publishing their work.