The QoA x Eir Aoi Misty Blue ranks #562 out of 1084 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: QoA
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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#562 QoA x Eir Aoi Misty Blue e-earphone (JP) eBay
Pros: A collaboration with singer Eir Aoi, with two dynamic drivers and two balanced armatures. Measurements show bass right on the Harman target and full sub-bass to 20 Hz (score 70 across six measurements).
Cons: Treble sits about 4.4 dB below target, a dark, relaxed balance. It is sold mainly through Japanese retailers.
Is the QoA x Eir Aoi Misty Blue right for you?
Buy it if
- your taste runs warm: it scores 81 for that sound.
- you are sensitive to bright or sharp treble (treble sits 4.4 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.
| Released | 2025 (1 year ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.11 dB standard deviation |
| Driver Type | Hybrid |
| Drivers | 2 x dynamic + 2 x balanced armature |
| Form Factor | In-ear |
| Harman Preference Score | 70 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 30 ohms |
| Sensitivity | 105 dB +/-2 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) |
| Tonal Tilt | -0.65 (negative is warmer, positive brighter) |
EQ Presets
Harman 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 Harman match with this EQ: 85 out of 100, up from 70.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +0.9 dB | 0.70 |
| High shelf | 10,000 Hz | -4.9 dB | 0.70 |
| Peak | 164 Hz | -1.6 dB | 1.40 |
| Peak | 544 Hz | +1.6 dB | 2.10 |
| Peak | 1,444 Hz | -2.5 dB | 2.98 |
| Peak | 2,788 Hz | +1.6 dB | 4.49 |
| Peak | 4,181 Hz | +6.0 dB | 1.09 |
Neutral 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 Neutral match with this EQ: 86 out of 100, up from 35.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -7.7 dB | 0.70 |
| High shelf | 10,000 Hz | -4.9 dB | 0.70 |
| Peak | 135 Hz | -1.6 dB | 1.06 |
| Peak | 544 Hz | +1.6 dB | 2.13 |
| Peak | 1,445 Hz | -2.5 dB | 2.98 |
| Peak | 2,787 Hz | +1.6 dB | 4.43 |
| Peak | 4,180 Hz | +6.0 dB | 1.08 |
Studio flat target
Set a preamp of -6.2 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: 83 out of 100, up from 16.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.2 dB | 0.70 |
| High shelf | 10,000 Hz | +1.3 dB | 0.70 |
| Peak | 163 Hz | -3.5 dB | 0.96 |
| Peak | 1,471 Hz | -2.7 dB | 2.52 |
| Peak | 2,954 Hz | +6.0 dB | 1.28 |
| Peak | 4,641 Hz | +2.6 dB | 3.19 |
Warm target
Set a preamp of -4.1 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 Warm match with this EQ: 84 out of 100, up from 81.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.1 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 1,490 Hz | -2.5 dB | 3.27 |
| Peak | 4,148 Hz | +4.2 dB | 1.25 |
Bass 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 Bass match with this EQ: 87 out of 100, up from 72.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.7 dB | 0.70 |
| High shelf | 10,000 Hz | -4.9 dB | 0.70 |
| Peak | 164 Hz | -1.6 dB | 1.51 |
| Peak | 546 Hz | +1.6 dB | 2.15 |
| Peak | 1,444 Hz | -2.5 dB | 2.98 |
| Peak | 2,788 Hz | +1.6 dB | 4.49 |
| Peak | 4,181 Hz | +6.0 dB | 1.09 |
Bright 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 80 out of 100, up from 22.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -7.7 dB | 0.70 |
| High shelf | 10,000 Hz | -1.1 dB | 0.70 |
| Peak | 134 Hz | -1.7 dB | 1.01 |
| Peak | 544 Hz | +1.6 dB | 2.11 |
| Peak | 1,454 Hz | -2.7 dB | 2.55 |
| Peak | 3,133 Hz | +2.8 dB | 3.34 |
| Peak | 5,345 Hz | +5.8 dB | 0.67 |
| Peak | 6,947 Hz | -3.5 dB | 5.46 |
V-shaped 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 77 out of 100, up from 61.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.3 dB | 0.70 |
| Peak | 472 Hz | +1.9 dB | 1.70 |
| Peak | 1,399 Hz | -2.9 dB | 2.56 |
| Peak | 3,014 Hz | +3.0 dB | 3.30 |
| Peak | 5,345 Hz | +5.7 dB | 0.61 |
| Peak | 6,994 Hz | -3.7 dB | 5.34 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the QoA x Eir Aoi Misty Blue 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, hu-fi, jaytiss, practiphile, pw and soundcheck39. Thanks to each of them for publishing their work.