The CCZ BC02 ranks #1036 out of 1369 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: CCZ
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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#1036 CCZ BC02: 2.00 KeepHiFi 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, 2.7 dB standard deviation from target.
Is the CCZ BC02 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 20 points.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.72 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic driver (CNT diaphragm) |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz |
| Harman Preference Score | 63 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 18 ohms |
| Sensitivity | 108 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.2 dB at 30 Hz) |
| Tonal Tilt | -0.58 (negative is warmer, positive brighter) |
| Weight | 0 lbs (4 g) (per earbud) |
EQ Presets
Harman target
Set a preamp of -5.9 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 82 out of 100, up from 63.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.5 dB | 0.70 |
| High shelf | 10,000 Hz | -0.7 dB | 0.70 |
| Peak | 186 Hz | -4.1 dB | 0.87 |
| Peak | 739 Hz | +2.0 dB | 1.80 |
| Peak | 1,914 Hz | -4.0 dB | 4.43 |
| Peak | 3,117 Hz | +3.0 dB | 4.74 |
| Peak | 4,256 Hz | -2.2 dB | 6.00 |
| Peak | 5,649 Hz | +6.0 dB | 4.33 |
Neutral target
Set a preamp of -5.9 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 84 out of 100, up from 29.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.0 dB | 0.70 |
| High shelf | 10,000 Hz | -0.7 dB | 0.70 |
| Peak | 153 Hz | -4.1 dB | 0.75 |
| Peak | 755 Hz | +2.0 dB | 2.00 |
| Peak | 1,913 Hz | -4.0 dB | 4.41 |
| Peak | 3,117 Hz | +3.0 dB | 4.75 |
| Peak | 4,256 Hz | -2.2 dB | 6.00 |
| Peak | 5,649 Hz | +6.0 dB | 4.33 |
Studio flat target
Set a preamp of -5.8 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 3 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 | +1.8 dB | 0.70 |
| Peak | 163 Hz | -6.0 dB | 0.77 |
| Peak | 779 Hz | +1.9 dB | 1.96 |
| Peak | 1,871 Hz | -3.2 dB | 5.57 |
| Peak | 2,606 Hz | +1.5 dB | 6.00 |
| Peak | 3,000 Hz | +5.1 dB | 5.24 |
| Peak | 4,263 Hz | -3.6 dB | 6.00 |
| Peak | 5,743 Hz | +6.0 dB | 5.07 |
Warm target
Set a preamp of -4.5 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 85 out of 100, up from 68.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.2 dB | 0.70 |
| High shelf | 10,000 Hz | -3.3 dB | 0.70 |
| Peak | 99 Hz | -1.3 dB | 2.32 |
| Peak | 186 Hz | -3.9 dB | 0.94 |
| Peak | 751 Hz | +2.2 dB | 1.60 |
| Peak | 1,938 Hz | -4.8 dB | 3.65 |
| Peak | 3,140 Hz | +1.9 dB | 5.53 |
| Peak | 4,218 Hz | -4.7 dB | 6.00 |
| Peak | 5,816 Hz | +6.0 dB | 6.00 |
| Peak | 7,947 Hz | -3.8 dB | 6.00 |
Bass target
Set a preamp of -5.9 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 84 out of 100, up from 67.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.3 dB | 0.70 |
| High shelf | 10,000 Hz | -0.7 dB | 0.70 |
| Peak | 186 Hz | -4.1 dB | 0.91 |
| Peak | 744 Hz | +2.0 dB | 1.85 |
| Peak | 1,914 Hz | -4.0 dB | 4.41 |
| Peak | 3,117 Hz | +3.0 dB | 4.75 |
| Peak | 4,256 Hz | -2.2 dB | 6.00 |
| Peak | 5,649 Hz | +6.0 dB | 4.33 |
Bright target
Set a preamp of -5.9 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 82 out of 100, up from 20.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.3 dB | 0.70 |
| Peak | 153 Hz | -4.1 dB | 0.73 |
| Peak | 753 Hz | +2.0 dB | 2.03 |
| Peak | 1,897 Hz | -4.0 dB | 4.79 |
| Peak | 2,185 Hz | -1.2 dB | 6.00 |
| Peak | 3,119 Hz | +3.7 dB | 5.18 |
| Peak | 4,239 Hz | -1.9 dB | 6.00 |
| Peak | 5,458 Hz | +6.0 dB | 2.64 |
V-shaped target
Set a preamp of -6.0 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 81 out of 100, up from 63.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +3.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.7 dB | 0.70 |
| Peak | 153 Hz | -2.8 dB | 0.98 |
| Peak | 701 Hz | +1.6 dB | 1.78 |
| Peak | 1,885 Hz | -3.6 dB | 3.70 |
| Peak | 2,765 Hz | +1.4 dB | 6.00 |
| Peak | 3,123 Hz | +4.0 dB | 6.00 |
| Peak | 4,274 Hz | -1.9 dB | 6.00 |
| Peak | 5,385 Hz | +6.0 dB | 2.27 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the CCZ BC02 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 3 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 3 measurements from the squig.link databases of eplv, pw and tdl. Thanks to each of them for publishing their work.
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