The R2E3 Mermaid ranks #1091 out of 1398 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Prices on this page were last checked October 19, 2026 at 10:32 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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#1091 R2E3 Mermaid: $66.00 Discontinued eBay
Pros: A single beryllium plated dynamic driver earphone whose presence is about 1.4 dB above target, so vocals come through clearly, and the midrange stays close to target. 106 dB sensitivity runs from a phone.
Cons: Sub bass sits about 6.4 dB below target, so the low end is thin, and an 8.6 dB dip near 6.3 kHz followed by a 5 dB peak near 8.2 kHz makes the treble uneven. Deviation is high at 3.1 dB, and it is discontinued.
Is the R2E3 Mermaid right for you?
Buy it if
- you are happy to use EQ: our preset lifts its Harman match by about 24 points.
Skip it if
- you want to buy it new: it is discontinued.
| Released | 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 3.14 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm beryllium-plated dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 62 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 17 ohms |
| Sensitivity | 106 dB @1kHz |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-5.3 dB at 30 Hz) |
| Tonal Tilt | +0.44 (negative is warmer, positive brighter) |
EQ Presets
Harman 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 86 out of 100, up from 62.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +3.8 dB | 0.70 |
| High shelf | 10,000 Hz | +0.5 dB | 0.70 |
| Peak | 23 Hz | +2.6 dB | 1.57 |
| Peak | 73 Hz | -1.2 dB | 2.82 |
| Peak | 148 Hz | -4.0 dB | 0.75 |
| Peak | 288 Hz | -0.8 dB | 2.96 |
| Peak | 804 Hz | +1.5 dB | 1.84 |
| Peak | 2,396 Hz | -4.8 dB | 2.23 |
| Peak | 4,055 Hz | -2.1 dB | 6.00 |
| Peak | 5,767 Hz | +6.0 dB | 5.43 |
Neutral 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 Neutral match with this EQ: 87 out of 100, up from 54.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -4.7 dB | 0.70 |
| High shelf | 10,000 Hz | +0.5 dB | 0.70 |
| Peak | 23 Hz | +2.4 dB | 1.81 |
| Peak | 69 Hz | -1.0 dB | 2.85 |
| Peak | 139 Hz | -4.1 dB | 0.70 |
| Peak | 282 Hz | -0.9 dB | 2.87 |
| Peak | 802 Hz | +1.5 dB | 1.82 |
| Peak | 2,396 Hz | -4.8 dB | 2.24 |
| Peak | 4,055 Hz | -2.1 dB | 6.00 |
| Peak | 5,767 Hz | +6.0 dB | 5.43 |
Studio flat 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 Studio flat match with this EQ: 88 out of 100, up from 40.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -7.2 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 23 Hz | +1.9 dB | 2.10 |
| Peak | 159 Hz | -5.8 dB | 0.70 |
| Peak | 785 Hz | +1.5 dB | 2.10 |
| Peak | 2,237 Hz | -3.2 dB | 5.36 |
| Peak | 4,139 Hz | -3.5 dB | 5.35 |
| Peak | 5,859 Hz | +6.0 dB | 6.00 |
| Peak | 8,000 Hz | +1.0 dB | 1.60 |
Warm 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 89 out of 100, up from 59.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.0 dB | 0.70 |
| High shelf | 10,000 Hz | -3.1 dB | 0.70 |
| Peak | 24 Hz | +2.4 dB | 1.58 |
| Peak | 143 Hz | -3.8 dB | 0.79 |
| Peak | 808 Hz | +1.8 dB | 1.80 |
| Peak | 2,476 Hz | -5.8 dB | 1.89 |
| Peak | 4,121 Hz | -3.8 dB | 5.73 |
| Peak | 5,884 Hz | +6.0 dB | 6.00 |
Bass 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 82 out of 100, up from 48.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.6 dB | 0.70 |
| High shelf | 10,000 Hz | +0.5 dB | 0.70 |
| Peak | 49 Hz | +1.2 dB | 2.23 |
| Peak | 180 Hz | -3.6 dB | 0.96 |
| Peak | 807 Hz | +1.5 dB | 1.85 |
| Peak | 2,396 Hz | -4.8 dB | 2.23 |
| Peak | 4,055 Hz | -2.1 dB | 6.00 |
| Peak | 5,768 Hz | +6.0 dB | 5.44 |
Bright 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 Bright match with this EQ: 78 out of 100, up from 42.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -4.7 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 23 Hz | +2.3 dB | 1.82 |
| Peak | 139 Hz | -4.2 dB | 0.69 |
| Peak | 782 Hz | +1.5 dB | 2.10 |
| Peak | 2,321 Hz | -4.8 dB | 3.04 |
| Peak | 5,543 Hz | +6.0 dB | 3.74 |
V-shaped 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 75 out of 100, up from 48.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.8 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 53 Hz | +0.9 dB | 2.33 |
| Peak | 178 Hz | -2.2 dB | 1.15 |
| Peak | 698 Hz | +1.1 dB | 2.14 |
| Peak | 2,303 Hz | -4.3 dB | 3.39 |
| Peak | 5,488 Hz | +6.0 dB | 3.37 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the R2E3 Mermaid 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, fahryst and timmyv. Thanks to each of them for publishing their work.