The Etymotic ER4P ranks #635 out of 668 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: Etymotic
Prices on this page were last checked October 12, 2026 at 4:13 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.
#635 Etymotic ER4P Discontinued eBay
Pros: Its tonal tilt of +0.61 sits close to the target, so the overall balance is neither dark nor bright. It uses 1 x balanced armature with an easy 27 ohm load.
Cons: Discontinued, so it is mainly found used. Its 4.22 dB spread from the target means a noticeably uneven response. A Harman score of 48 places it in the lower part of the in-ear rankings.
| Connection | Wired |
|---|---|
| Deviation From Target | 4.22 dB standard deviation |
| Driver Type | Balanced armature |
| Drivers | 1 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 16kHz |
| Harman Preference Score | 48 (measured by crinacle, via AutoEQ) |
| Impedance | 27 ohms |
| Sensitivity | 106 dB/mW |
| Tonal Tilt | +0.61 (negative is warmer, positive brighter) |
EQ preset to match the 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 AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +6.3 dB | 0.70 |
| Peak | 6,729 Hz | +9.3 dB | 0.57 |
| Peak | 2,513 Hz | -5.7 dB | 0.37 |
| Peak | 215 Hz | -1.9 dB | 0.69 |
| Peak | 886 Hz | +2.4 dB | 1.93 |
| High shelf | 10,000 Hz | +3.5 dB | 0.70 |
| Peak | 8,198 Hz | -1.4 dB | 2.43 |
| Peak | 5,618 Hz | +1.0 dB | 6.00 |
| Peak | 4,318 Hz | -0.5 dB | 3.02 |
| Peak | 2,156 Hz | +0.4 dB | 3.56 |
- Reviews, Comparisons and Sound Samples