The TRN TA4 ranks #905 out of 1369 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: TRN
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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#905 TRN TA4: 6.00 TRN eBay
Pros: A broadly balanced tuning with a preference score of 66 against the Harman target.
Cons: Treble about 3 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones. An uneven response, 2.8 dB standard deviation from target.
Is the TRN TA4 right for you?
Buy it if
- you are sensitive to bright or sharp treble (treble sits 3.3 dB below target).
- you are happy to use EQ: our preset lifts its Harman match by about 24 points.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.82 dB standard deviation |
| Driver Type | Hybrid |
| Drivers | 2 dynamic drivers + 2 balanced armatures (10mm beryllium DD + 6mm titanium DD + dual Knowles 33518 BA) |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz |
| Harman Preference Score | 66 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 20 ohms |
| Sensitivity | 105 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.8 dB at 30 Hz) |
| Tonal Tilt | -0.21 (negative is warmer, positive brighter) |
EQ Presets
Harman 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 Harman match with this EQ: 90 out of 100, up from 66.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.5 dB | 0.70 |
| High shelf | 10,000 Hz | -3.4 dB | 0.70 |
| Peak | 23 Hz | +2.5 dB | 1.95 |
| Peak | 174 Hz | -3.9 dB | 0.72 |
| Peak | 719 Hz | +1.4 dB | 2.05 |
| Peak | 1,775 Hz | -2.3 dB | 3.60 |
| Peak | 3,121 Hz | +3.9 dB | 5.03 |
| Peak | 5,016 Hz | +5.7 dB | 1.06 |
| Peak | 7,462 Hz | -3.8 dB | 5.01 |
Neutral 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 Neutral match with this EQ: 92 out of 100, up from 42.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -6.0 dB | 0.70 |
| High shelf | 10,000 Hz | -3.4 dB | 0.70 |
| Peak | 23 Hz | +2.1 dB | 2.54 |
| Peak | 73 Hz | -1.3 dB | 1.77 |
| Peak | 174 Hz | -4.0 dB | 0.65 |
| Peak | 696 Hz | +1.5 dB | 1.77 |
| Peak | 1,780 Hz | -2.3 dB | 3.69 |
| Peak | 3,120 Hz | +3.9 dB | 5.01 |
| Peak | 5,016 Hz | +5.7 dB | 1.06 |
| Peak | 7,462 Hz | -3.8 dB | 5.02 |
Studio flat target
Set a preamp of -6.3 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 90 out of 100, up from 23.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -8.6 dB | 0.70 |
| High shelf | 10,000 Hz | +1.2 dB | 0.70 |
| Peak | 168 Hz | -5.8 dB | 0.69 |
| Peak | 1,747 Hz | -2.3 dB | 3.67 |
| Peak | 2,605 Hz | +1.4 dB | 6.00 |
| Peak | 3,148 Hz | +6.0 dB | 1.40 |
| Peak | 5,518 Hz | +3.7 dB | 4.60 |
| Peak | 7,472 Hz | -1.7 dB | 6.00 |
Warm 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 92 out of 100, up from 70.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.8 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 23 Hz | +2.5 dB | 2.07 |
| Peak | 174 Hz | -3.7 dB | 0.73 |
| Peak | 719 Hz | +1.7 dB | 1.95 |
| Peak | 1,813 Hz | -2.7 dB | 3.62 |
| Peak | 3,001 Hz | +1.9 dB | 6.00 |
| Peak | 3,807 Hz | +4.2 dB | 1.49 |
| Peak | 5,720 Hz | +3.5 dB | 6.00 |
| Peak | 7,595 Hz | -3.3 dB | 6.00 |
Bass 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 Bass match with this EQ: 88 out of 100, up from 58.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.3 dB | 0.70 |
| High shelf | 10,000 Hz | -3.4 dB | 0.70 |
| Peak | 38 Hz | +1.2 dB | 1.55 |
| Peak | 179 Hz | -3.8 dB | 0.86 |
| Peak | 744 Hz | +1.3 dB | 2.47 |
| Peak | 1,769 Hz | -2.3 dB | 3.48 |
| Peak | 3,122 Hz | +3.9 dB | 5.07 |
| Peak | 5,016 Hz | +5.7 dB | 1.06 |
| Peak | 7,462 Hz | -3.8 dB | 5.01 |
Bright target
Set a preamp of -6.5 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 85 out of 100, up from 30.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -6.0 dB | 0.70 |
| High shelf | 10,000 Hz | +0.3 dB | 0.70 |
| Peak | 23 Hz | +2.0 dB | 2.47 |
| Peak | 73 Hz | -1.2 dB | 1.78 |
| Peak | 174 Hz | -4.0 dB | 0.61 |
| Peak | 676 Hz | +1.4 dB | 1.73 |
| Peak | 1,855 Hz | -3.2 dB | 2.72 |
| Peak | 3,354 Hz | +6.0 dB | 1.19 |
| Peak | 5,491 Hz | +4.3 dB | 3.60 |
V-shaped target
Set a preamp of -6.5 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 4 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 | +5.6 dB | 0.70 |
| High shelf | 10,000 Hz | +1.3 dB | 0.70 |
| Peak | 174 Hz | -2.4 dB | 1.00 |
| Peak | 1,741 Hz | -2.9 dB | 2.15 |
| Peak | 3,354 Hz | +6.0 dB | 1.12 |
| Peak | 5,456 Hz | +4.0 dB | 3.57 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the TRN TA4 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 arn, eplv, ianfann and tonedeafmonk. Thanks to each of them for publishing their work.
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