The HarmonicDyne Devil ranks #750 out of 1253 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: HarmonicDyne
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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#750 HarmonicDyne Devil: $199 Discontinued eBay
Pros: A broadly balanced tuning with a preference score of 69 against the Harman target.
Cons: An uneven response, 2.3 dB standard deviation from target. Discontinued.
Is the HarmonicDyne Devil right for you?
Buy it if
- you are happy to use EQ: our preset lifts its Harman match by about 23 points.
Skip it if
- you want more bass (about 3 dB below target).
- you want to buy it new: it is discontinued.
| Back | Closed |
|---|---|
| Connection | Wired (3.5mm / 4.4mm) |
| Deviation From Target | 2.33 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 2 Dynamic (10mm dual CNC coaxial) |
| Form Factor | In-ear |
| Harman Preference Score | 69 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.7 dB at 30 Hz) |
| Tonal Tilt | +0.70 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -5.6 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 92 out of 100, up from 69.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.9 dB | 0.70 |
| Peak | 24 Hz | +1.6 dB | 1.73 |
| Peak | 174 Hz | -2.3 dB | 0.81 |
| Peak | 728 Hz | +1.3 dB | 1.93 |
| Peak | 2,110 Hz | -3.4 dB | 3.53 |
| Peak | 3,093 Hz | +1.7 dB | 5.12 |
| Peak | 3,545 Hz | +4.7 dB | 5.63 |
| Peak | 5,568 Hz | -1.4 dB | 2.49 |
| Peak | 7,579 Hz | -1.8 dB | 6.00 |
Neutral target
Set a preamp of -4.6 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 93 out of 100, up from 66.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -4.5 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 76 Hz | -1.1 dB | 2.26 |
| Peak | 174 Hz | -2.4 dB | 0.71 |
| Peak | 705 Hz | +1.4 dB | 1.68 |
| Peak | 2,110 Hz | -3.4 dB | 3.54 |
| Peak | 3,094 Hz | +1.6 dB | 4.96 |
| Peak | 3,545 Hz | +4.7 dB | 5.63 |
| Peak | 5,568 Hz | -1.4 dB | 2.48 |
| Peak | 7,580 Hz | -1.8 dB | 6.00 |
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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 93 out of 100, up from 48.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -7.1 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 168 Hz | -4.2 dB | 0.75 |
| Peak | 752 Hz | +1.2 dB | 2.30 |
| Peak | 2,034 Hz | -2.0 dB | 5.34 |
| Peak | 2,733 Hz | +1.3 dB | 6.00 |
| Peak | 3,305 Hz | +5.9 dB | 4.51 |
| Peak | 3,869 Hz | +2.0 dB | 6.00 |
| Peak | 5,296 Hz | -3.4 dB | 3.57 |
| Peak | 7,227 Hz | -1.2 dB | 4.32 |
Warm 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 94 out of 100, up from 62.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +4.3 dB | 0.70 |
| High shelf | 10,000 Hz | +1.3 dB | 0.70 |
| Peak | 24 Hz | +1.5 dB | 1.88 |
| Peak | 79 Hz | -1.1 dB | 2.04 |
| Peak | 174 Hz | -2.1 dB | 0.85 |
| Peak | 721 Hz | +1.6 dB | 1.85 |
| Peak | 2,110 Hz | -4.1 dB | 4.13 |
| Peak | 3,529 Hz | +3.9 dB | 5.05 |
| Peak | 4,962 Hz | -2.1 dB | 6.00 |
| Peak | 7,651 Hz | -4.4 dB | 1.14 |
Bass 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 86 out of 100, up from 52.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +5.9 dB | 0.70 |
| High shelf | 10,000 Hz | +1.9 dB | 0.70 |
| Peak | 59 Hz | +0.9 dB | 2.77 |
| Peak | 204 Hz | -2.2 dB | 1.34 |
| Peak | 751 Hz | +1.2 dB | 2.23 |
| Peak | 2,110 Hz | -3.4 dB | 3.54 |
| Peak | 3,093 Hz | +1.7 dB | 5.29 |
| Peak | 3,545 Hz | +4.7 dB | 5.64 |
| Peak | 5,568 Hz | -1.4 dB | 2.49 |
| Peak | 7,578 Hz | -1.8 dB | 6.00 |
Bright target
Set a preamp of -5.9 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 89 out of 100, up from 56.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -4.5 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 174 Hz | -2.4 dB | 0.69 |
| Peak | 2,106 Hz | -3.5 dB | 3.69 |
| Peak | 3,730 Hz | +6.0 dB | 3.12 |
| Peak | 6,532 Hz | +1.8 dB | 2.14 |
V-shaped 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 4 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 82 out of 100, up from 55.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +6.0 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 70 Hz | +1.0 dB | 2.55 |
| Peak | 2,091 Hz | -3.1 dB | 3.66 |
| Peak | 3,146 Hz | +1.5 dB | 6.00 |
| Peak | 3,763 Hz | +6.0 dB | 2.45 |
| Peak | 5,968 Hz | +2.7 dB | 4.87 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the HarmonicDyne Devil 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 4 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 4 measurements from the squig.link databases of hbb, kazi, nymz and pw. Thanks to each of them for publishing their work.