HarmonicDyne Helios EQ settings
Parametric EQ correction for the HarmonicDyne Helios, derived from measurements by crinacle. It moves the measured frequency response toward a neutral target.
The correction curve
The solid line is the full measured correction (all 10 filters). The dashed line is what Atrium applies: the same shape at 65 percent strength, capped at 6 dB per band, so the headphone keeps its own character instead of being forced flat.
Parametric EQ settings
Preamp: -6.2 dB (prevents clipping from the boosts below)
| # | Type | Frequency | Gain | Q |
|---|---|---|---|---|
| 1 | Low shelf | 105 Hz | +6.9 dB | 0.70 |
| 2 | Peaking | 1.01 kHz | +3.7 dB | 0.61 |
| 3 | Peaking | 93 Hz | -4.8 dB | 0.43 |
| 4 | Peaking | 5.8 kHz | -2.9 dB | 0.85 |
| 5 | Peaking | 38 Hz | +2.1 dB | 1.76 |
| 6 | High shelf | 1 kHz | -8.1 dB | 0.70 |
| 7 | Peaking | 1 kHz | +3.8 dB | 1.35 |
| 8 | Peaking | 4.33 kHz | +2.3 dB | 5.82 |
| 9 | Peaking | 5.1 kHz | -2.5 dB | 6.00 |
| 10 | Peaking | 2.76 kHz | -1.2 dB | 4.16 |
This is the full measured correction in AutoEq format. It pastes straight into Equalizer APO or Peace on Windows, and into most parametric EQ apps.
How to use these settings
Manually: enter the preamp and each filter into any parametric EQ. On Windows that is usually Equalizer APO with the Peace interface. On a Mac, eqMac or SoundSource. Set the type, frequency, gain and Q exactly as listed.
With Atrium: pick your Helios in the app and it applies a tuned version of this correction: 65 percent strength with a 6 dB per-band cap, which fixes the rough spots without erasing what the headphone does well. Atrium also measures how you hear with a short listening test and layers your personal hearing profile on top. Two people with the same headphones do not hear the same sound. Headphone corrections are part of Signature Edition; the app itself is free.