The EarAcoustic Audio SPA Limited Edition ranks #440 out of 1253 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: EarAcoustic
Prices on this page were last checked October 16, 2026 at 5:46 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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#440 EarAcoustic Audio SPA Limited Edition: $429.90 HiFiGo $429.90 eBay
Pros: A broadly balanced tuning with a preference score of 74 against the Harman target.
Cons: Treble about 2 dB above target from 3 to 10 kHz, which can sound sharp or tiring at higher volume. An uneven response, 2.1 dB standard deviation from target.
Is the EarAcoustic Audio SPA Limited Edition right for you?
Buy it if
- 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 are treble-sensitive (treble sits about 2.0 dB above target).
- you want the best value: the higher-rated EPZ G10 costs about $406 less.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.12 dB standard deviation |
| Driver Type | Balanced Armature |
| Drivers | 6 x balanced armature |
| Form Factor | In-ear |
| Harman Preference Score | 74 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.8 dB at 30 Hz) |
| Tonal Tilt | +0.18 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -2.5 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 89 out of 100, up from 74.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +0.3 dB | 0.70 |
| High shelf | 10,000 Hz | +1.1 dB | 0.70 |
| Peak | 23 Hz | +2.3 dB | 2.11 |
| Peak | 186 Hz | -4.5 dB | 0.70 |
| Peak | 8,000 Hz | -6.5 dB | 3.34 |
Neutral target
Set a preamp of -1.2 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 90 out of 100, up from 48.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -8.2 dB | 0.70 |
| High shelf | 10,000 Hz | +1.1 dB | 0.70 |
| Peak | 81 Hz | -1.4 dB | 1.96 |
| Peak | 186 Hz | -4.5 dB | 0.63 |
| Peak | 708 Hz | +1.3 dB | 1.47 |
| Peak | 8,000 Hz | -6.5 dB | 3.34 |
Studio flat target
Set a preamp of -3.3 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 Studio flat match with this EQ: 93 out of 100, up from 30.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.8 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 169 Hz | -6.4 dB | 0.69 |
| Peak | 2,665 Hz | +3.4 dB | 2.48 |
| Peak | 4,838 Hz | -2.6 dB | 5.36 |
| Peak | 7,732 Hz | -4.9 dB | 2.34 |
Warm target
Set a preamp of -2.8 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 92 out of 100, up from 68.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +0.6 dB | 0.70 |
| High shelf | 10,000 Hz | -2.1 dB | 0.70 |
| Peak | 23 Hz | +2.3 dB | 2.26 |
| Peak | 83 Hz | -1.3 dB | 1.78 |
| Peak | 186 Hz | -4.3 dB | 0.71 |
| Peak | 733 Hz | +1.5 dB | 1.95 |
| Peak | 1,623 Hz | -0.7 dB | 2.55 |
| Peak | 4,623 Hz | -1.3 dB | 4.51 |
| Peak | 6,131 Hz | +1.7 dB | 6.00 |
| Peak | 8,000 Hz | -6.6 dB | 1.17 |
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: 91 out of 100, up from 63.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.1 dB | 0.70 |
| Peak | 23 Hz | +2.3 dB | 1.70 |
| Peak | 186 Hz | -4.5 dB | 0.74 |
| Peak | 8,000 Hz | -6.5 dB | 3.33 |
Bright target
Set a preamp of -2.1 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 92 out of 100, up from 41.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -8.2 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 23 Hz | +1.8 dB | 2.35 |
| Peak | 79 Hz | -1.4 dB | 2.02 |
| Peak | 186 Hz | -4.5 dB | 0.63 |
| Peak | 685 Hz | +1.2 dB | 1.46 |
| Peak | 3,320 Hz | +1.0 dB | 3.50 |
| Peak | 5,345 Hz | +1.8 dB | 0.83 |
| Peak | 7,726 Hz | -3.4 dB | 6.00 |
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: 92 out of 100, up from 69.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.6 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 25 Hz | +1.8 dB | 1.77 |
| Peak | 84 Hz | -1.1 dB | 2.00 |
| Peak | 186 Hz | -3.1 dB | 0.72 |
| Peak | 620 Hz | +0.8 dB | 1.87 |
| Peak | 1,346 Hz | -0.9 dB | 3.54 |
| Peak | 3,097 Hz | +1.1 dB | 2.93 |
| Peak | 5,345 Hz | +2.6 dB | 0.83 |
| Peak | 7,757 Hz | -2.6 dB | 6.00 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the EarAcoustic Audio SPA Limited Edition 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 atechreviews, ducbloke and hobbytalk. Thanks to each of them for publishing their work.