The Co-Donguri Brass ranks #931 out of 1291 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
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.
As an eBay Partner, we may be compensated if you make a purchase.
#931 Co-Donguri Brass: $45 Discontinued Amazon $45 eBay
Pros: A broadly balanced tuning with a preference score of 65 against the Harman target.
Cons: An uneven response, 2.6 dB standard deviation from target. Discontinued.
Is the Co-Donguri Brass 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 23 points.
Skip it if
- you want to buy it new: it is discontinued.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.64 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic driver (with Tornado Equalizer) |
| Form Factor | In-ear |
| Frequency Response | 5Hz - 40kHz |
| Harman Preference Score | 65 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 18 ohms |
| Sensitivity | 106 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Tonal Tilt | -0.45 (negative is warmer, positive brighter) |
| Weight | 0 lbs (16 g) (0 lbs (22 g) with cable) |
EQ Presets
Harman target
Set a preamp of -2.7 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 88 out of 100, up from 65.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.8 dB | 0.70 |
| High shelf | 10,000 Hz | -2.8 dB | 0.70 |
| Peak | 32 Hz | +1.5 dB | 1.23 |
| Peak | 182 Hz | -6.6 dB | 0.69 |
| Peak | 883 Hz | +1.7 dB | 2.11 |
| Peak | 2,549 Hz | -5.0 dB | 4.77 |
| Peak | 4,509 Hz | -6.1 dB | 4.49 |
| Peak | 6,442 Hz | +3.5 dB | 4.13 |
Neutral target
Set a preamp of -2.7 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 90 out of 100, up from 34.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.3 dB | 0.70 |
| High shelf | 10,000 Hz | -2.8 dB | 0.70 |
| Peak | 32 Hz | +1.0 dB | 1.49 |
| Peak | 179 Hz | -6.4 dB | 0.62 |
| Peak | 873 Hz | +1.8 dB | 1.95 |
| Peak | 2,550 Hz | -5.0 dB | 4.82 |
| Peak | 4,510 Hz | -6.1 dB | 4.52 |
| Peak | 6,443 Hz | +3.5 dB | 4.13 |
Studio flat target
Set a preamp of -1.8 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 15.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -12.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.6 dB | 0.70 |
| Peak | 182 Hz | -8.5 dB | 0.69 |
| Peak | 944 Hz | +1.6 dB | 1.64 |
| Peak | 2,562 Hz | -1.8 dB | 6.00 |
| Peak | 4,632 Hz | -7.6 dB | 4.89 |
| Peak | 6,660 Hz | +2.0 dB | 4.03 |
Warm target
Set a preamp of -1.3 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: 89 out of 100, up from 70.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.5 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 23 Hz | +1.6 dB | 1.25 |
| Peak | 182 Hz | -6.4 dB | 0.72 |
| Peak | 901 Hz | +2.0 dB | 1.81 |
| Peak | 2,514 Hz | -3.9 dB | 6.00 |
| Peak | 4,148 Hz | -5.3 dB | 1.15 |
| Peak | 4,763 Hz | -2.6 dB | 6.00 |
| Peak | 6,383 Hz | +4.0 dB | 5.49 |
Bass target
Set a preamp of -3.8 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 Bass match with this EQ: 90 out of 100, up from 64.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.0 dB | 0.70 |
| High shelf | 10,000 Hz | -2.8 dB | 0.70 |
| Peak | 23 Hz | +1.9 dB | 0.97 |
| Peak | 182 Hz | -6.6 dB | 0.70 |
| Peak | 344 Hz | -1.1 dB | 2.54 |
| Peak | 887 Hz | +1.7 dB | 2.20 |
| Peak | 2,549 Hz | -5.0 dB | 4.75 |
| Peak | 4,509 Hz | -6.1 dB | 4.48 |
| Peak | 6,441 Hz | +3.5 dB | 4.13 |
Bright target
Set a preamp of -5.0 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 Bright match with this EQ: 86 out of 100, up from 24.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.3 dB | 0.70 |
| High shelf | 10,000 Hz | +0.4 dB | 0.70 |
| Peak | 178 Hz | -6.5 dB | 0.62 |
| Peak | 887 Hz | +1.7 dB | 1.80 |
| Peak | 2,539 Hz | -4.5 dB | 4.40 |
| Peak | 4,585 Hz | -3.6 dB | 6.00 |
| Peak | 6,026 Hz | +4.8 dB | 6.00 |
| Peak | 8,000 Hz | +1.7 dB | 2.78 |
V-shaped target
Set a preamp of -5.3 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: 82 out of 100, up from 63.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.7 dB | 0.70 |
| High shelf | 10,000 Hz | +1.3 dB | 0.70 |
| Peak | 23 Hz | +1.8 dB | 0.99 |
| Peak | 171 Hz | -5.2 dB | 0.68 |
| Peak | 856 Hz | +1.1 dB | 2.54 |
| Peak | 2,538 Hz | -4.0 dB | 5.31 |
| Peak | 3,466 Hz | +1.8 dB | 6.00 |
| Peak | 4,591 Hz | -3.0 dB | 6.00 |
| Peak | 5,970 Hz | +5.2 dB | 6.00 |
| Peak | 7,569 Hz | +1.5 dB | 5.62 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the Co-Donguri Brass 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 arn, rg and superreview. Thanks to each of them for publishing their work.