The CVJ K-ES ranks #720 out of 1118 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: CVJ
Prices on this page were last checked October 16, 2026 at 5:46 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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#720 CVJ K-ES: $12 eBay
Pros: A broadly balanced tuning with a preference score of 67 against the Harman target.
Cons: An uneven response, 2.3 dB standard deviation from target.
Is the CVJ K-ES 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 21 points.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.33 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 67 (median of 10 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 22 ohms |
| Sensitivity | 115 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.4 dB at 30 Hz) |
| Tonal Tilt | -0.68 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -5.1 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 88 out of 100, up from 67.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.9 dB | 0.70 |
| High shelf | 10,000 Hz | -0.9 dB | 0.70 |
| Peak | 168 Hz | -4.2 dB | 0.87 |
| Peak | 739 Hz | +1.7 dB | 2.22 |
| Peak | 2,111 Hz | -2.7 dB | 3.09 |
| Peak | 4,259 Hz | -2.4 dB | 6.00 |
| Peak | 5,812 Hz | +6.0 dB | 5.26 |
Neutral target
Set a preamp of -5.1 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 89 out of 100, up from 30.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.4 dB | 0.70 |
| High shelf | 10,000 Hz | -0.9 dB | 0.70 |
| Peak | 156 Hz | -4.1 dB | 0.74 |
| Peak | 735 Hz | +1.7 dB | 2.15 |
| Peak | 2,113 Hz | -2.7 dB | 3.12 |
| Peak | 4,259 Hz | -2.4 dB | 6.00 |
| Peak | 5,812 Hz | +6.0 dB | 5.25 |
Studio flat target
Set a preamp of -5.1 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 88 out of 100, up from 13.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -12.0 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 162 Hz | -6.1 dB | 0.75 |
| Peak | 740 Hz | +1.7 dB | 2.61 |
| Peak | 1,877 Hz | -1.3 dB | 3.28 |
| Peak | 3,103 Hz | +2.9 dB | 5.33 |
| Peak | 4,374 Hz | -2.7 dB | 6.00 |
| Peak | 5,884 Hz | +5.3 dB | 6.00 |
Warm target
Set a preamp of -2.6 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 88 out of 100, up from 73.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.6 dB | 0.70 |
| High shelf | 10,000 Hz | -4.5 dB | 0.70 |
| Peak | 162 Hz | -4.0 dB | 0.93 |
| Peak | 765 Hz | +2.1 dB | 1.92 |
| Peak | 2,135 Hz | -2.3 dB | 3.97 |
| Peak | 3,893 Hz | -2.0 dB | 0.53 |
| Peak | 5,967 Hz | +4.5 dB | 6.00 |
Bass target
Set a preamp of -5.1 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 89 out of 100, up from 73.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.9 dB | 0.70 |
| High shelf | 10,000 Hz | -0.9 dB | 0.70 |
| Peak | 171 Hz | -4.2 dB | 0.90 |
| Peak | 741 Hz | +1.7 dB | 2.25 |
| Peak | 2,111 Hz | -2.7 dB | 3.07 |
| Peak | 4,259 Hz | -2.4 dB | 6.00 |
| Peak | 5,813 Hz | +6.0 dB | 5.26 |
Bright 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 83 out of 100, up from 20.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.4 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 156 Hz | -4.1 dB | 0.73 |
| Peak | 732 Hz | +1.7 dB | 2.28 |
| Peak | 2,064 Hz | -2.5 dB | 3.35 |
| Peak | 3,292 Hz | +1.8 dB | 6.00 |
| Peak | 5,550 Hz | +6.0 dB | 3.30 |
V-shaped target
Set a preamp of -6.1 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 10 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 80 out of 100, up from 65.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.6 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 33 Hz | +0.8 dB | 1.52 |
| Peak | 157 Hz | -2.9 dB | 0.98 |
| Peak | 666 Hz | +1.4 dB | 2.25 |
| Peak | 1,971 Hz | -2.0 dB | 3.26 |
| Peak | 3,275 Hz | +2.3 dB | 5.95 |
| Peak | 5,485 Hz | +6.0 dB | 2.86 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the CVJ K-ES 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 10 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 10 measurements from the squig.link databases of ankramutt, csi-zone, dl, eplv, hbb, ianfann, kuping-sensi, practiphile, pw and soundignity. Thanks to each of them for publishing their work.