The EPZ K1 ranks #964 out of 1369 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: EPZ
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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#964 EPZ K1: 9.99 Discontinued 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: An uneven response, 3.1 dB standard deviation from target. Discontinued.
Is the EPZ K1 right for you?
Buy it if
- you want sub-bass rumble that reaches down to 20 Hz.
- you are happy to use EQ: our preset lifts its Harman match by about 18 points.
Skip it if
- you want to buy it new: it is discontinued.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 3.07 dB standard deviation |
| Driver Type | Hybrid |
| Drivers | 1 dynamic driver + 1 balanced armature (9.2mm titanium DD + 1 BA) |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz |
| Harman Preference Score | 65 (median of 5 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 24 ohms |
| Sensitivity | 110 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.4 dB at 30 Hz) |
| Tonal Tilt | +0.04 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -6.7 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 83 out of 100, up from 65.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.1 dB | 0.70 |
| High shelf | 10,000 Hz | -3.6 dB | 0.70 |
| Peak | 23 Hz | +2.2 dB | 1.92 |
| Peak | 186 Hz | -4.4 dB | 0.71 |
| Peak | 712 Hz | +1.5 dB | 2.20 |
| Peak | 1,801 Hz | -2.1 dB | 3.11 |
| Peak | 3,140 Hz | +4.7 dB | 4.80 |
| Peak | 5,345 Hz | +3.2 dB | 0.59 |
| Peak | 8,000 Hz | -5.6 dB | 6.00 |
Neutral target
Set a preamp of -6.7 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 82 out of 100, up from 43.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -6.4 dB | 0.70 |
| High shelf | 10,000 Hz | -3.6 dB | 0.70 |
| Peak | 186 Hz | -4.4 dB | 0.65 |
| Peak | 690 Hz | +1.5 dB | 1.89 |
| Peak | 1,809 Hz | -2.1 dB | 3.22 |
| Peak | 3,139 Hz | +4.7 dB | 4.77 |
| Peak | 5,345 Hz | +3.2 dB | 0.59 |
| Peak | 8,000 Hz | -5.6 dB | 6.00 |
Studio flat 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 87 out of 100, up from 26.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -9.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.8 dB | 0.70 |
| Peak | 173 Hz | -6.3 dB | 0.70 |
| Peak | 731 Hz | +1.5 dB | 3.03 |
| Peak | 2,954 Hz | +6.0 dB | 2.06 |
| Peak | 3,599 Hz | +2.6 dB | 6.00 |
| Peak | 4,662 Hz | -2.9 dB | 6.00 |
| Peak | 5,919 Hz | +3.7 dB | 6.00 |
| Peak | 8,000 Hz | -3.1 dB | 6.00 |
Warm target
Set a preamp of -5.4 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 85 out of 100, up from 62.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.3 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 23 Hz | +2.3 dB | 1.98 |
| Peak | 186 Hz | -4.2 dB | 0.76 |
| Peak | 727 Hz | +1.8 dB | 1.94 |
| Peak | 1,832 Hz | -2.0 dB | 4.02 |
| Peak | 3,189 Hz | +5.5 dB | 3.97 |
| Peak | 4,599 Hz | -3.1 dB | 6.00 |
| Peak | 5,997 Hz | +4.4 dB | 6.00 |
| Peak | 7,976 Hz | -4.3 dB | 6.00 |
Bass target
Set a preamp of -6.7 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 82 out of 100, up from 53.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.2 dB | 0.70 |
| High shelf | 10,000 Hz | -3.6 dB | 0.70 |
| Peak | 36 Hz | +1.3 dB | 1.56 |
| Peak | 186 Hz | -4.4 dB | 0.82 |
| Peak | 734 Hz | +1.4 dB | 2.65 |
| Peak | 1,791 Hz | -2.1 dB | 2.99 |
| Peak | 3,141 Hz | +4.7 dB | 4.83 |
| Peak | 5,345 Hz | +3.2 dB | 0.59 |
| Peak | 8,000 Hz | -5.6 dB | 6.00 |
Bright target
Set a preamp of -6.7 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 83 out of 100, up from 34.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -6.5 dB | 0.70 |
| Peak | 186 Hz | -4.4 dB | 0.64 |
| Peak | 1,862 Hz | -2.4 dB | 3.12 |
| Peak | 3,354 Hz | +6.0 dB | 1.46 |
| Peak | 5,751 Hz | +5.4 dB | 6.00 |
V-shaped target
Set a preamp of -6.7 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 5 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 82 out of 100, up from 56.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.5 dB | 0.70 |
| High shelf | 10,000 Hz | +1.4 dB | 0.70 |
| Peak | 186 Hz | -3.0 dB | 0.87 |
| Peak | 1,820 Hz | -2.4 dB | 2.34 |
| Peak | 3,148 Hz | +6.0 dB | 1.39 |
| Peak | 5,672 Hz | +5.2 dB | 4.89 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the EPZ K1 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 5 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 5 measurements from the squig.link databases of aftersound, elrics, ianfann, obodio and practiphile. Thanks to each of them for publishing their work.