The EUIU EI-01 ranks #506 out of 1061 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: EUIU
Prices on this page were last checked October 15, 2026 at 5:41 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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#506 EUIU EI-01: $29.00 Linsoul $29.00 eBay
Pros: A cheap single dynamic IEM with a titanium composite diaphragm. Measurements show full sub-bass to 20 Hz (score 71 across six measurements).
Cons: Treble sits about 3.1 dB below target, a dark, relaxed balance.
Is the EUIU EI-01 right for you?
Buy it if
- your taste runs warm: it scores 80 for that sound.
- you are sensitive to bright or sharp treble (treble sits 3.1 dB below target).
- 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 15 points.
Skip it if
- you want the best value: the higher-rated EPZ G10 costs about $5 less.
| Released | 2026 (this year) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.08 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 71 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 109 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.6 dB at 30 Hz) |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) |
EQ Presets
Harman 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 86 out of 100, up from 71.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.2 dB | 0.70 |
| High shelf | 10,000 Hz | -4.1 dB | 0.70 |
| Peak | 209 Hz | -1.7 dB | 1.49 |
| Peak | 5,614 Hz | +6.0 dB | 2.39 |
Neutral 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 87 out of 100, up from 33.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -9.7 dB | 0.70 |
| High shelf | 10,000 Hz | -4.1 dB | 0.70 |
| Peak | 199 Hz | -1.6 dB | 1.18 |
| Peak | 5,613 Hz | +6.0 dB | 2.39 |
Studio flat target
Set a preamp of -3.1 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 86 out of 100, up from 15.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -11.5 dB | 0.70 |
| High shelf | 10,000 Hz | +1.5 dB | 0.70 |
| Peak | 186 Hz | -3.4 dB | 0.79 |
| Peak | 2,522 Hz | +1.9 dB | 5.32 |
| Peak | 4,205 Hz | -1.9 dB | 6.00 |
| Peak | 5,345 Hz | +3.0 dB | 0.66 |
Warm target
Set a preamp of -4.7 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 89 out of 100, up from 80.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -0.9 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 5,935 Hz | +5.2 dB | 3.34 |
Bass 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 88 out of 100, up from 77.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.6 dB | 0.70 |
| High shelf | 10,000 Hz | -4.1 dB | 0.70 |
| Peak | 212 Hz | -1.7 dB | 1.58 |
| Peak | 5,614 Hz | +6.0 dB | 2.39 |
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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 76 out of 100, up from 21.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -9.8 dB | 0.70 |
| Peak | 5,135 Hz | +6.0 dB | 1.71 |
V-shaped target
Set a preamp of -6.1 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 76 out of 100, up from 64.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +3.3 dB | 0.70 |
| High shelf | 10,000 Hz | +1.1 dB | 0.70 |
| Peak | 4,967 Hz | +6.0 dB | 1.51 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the EUIU EI-01 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 6 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 6 measurements from the squig.link databases of bassaudio, fernandagunsan, kuping-sensi, soundcheck39, soundignity and tdl. Thanks to each of them for publishing their work.