AutoEq / EqualizerAPO preset for Sennheiser HD 660S2 - Open‑Back Hi-Res Audiophile Wired Headphone

Generated from this product's measured frequency response (source: AutoEq · Filk), corrected toward an approximate Harman over-ear (OE 2018) target. This is an estimate - every ear and every rig differs; treat the numbers as a starting point.

Download parametric .txt Download GraphicEQ.txt

Parametric preset (AutoEq / EqualizerAPO format)

# Sennheiser HD 660S2 - Open‑Back Hi-Res Audiophile Wired Headphone - AutoEq-style parametric preset (measured: AutoEq · Filk)
# AutoEq-style parametric preset - TheTuningChoice (approximate Harman over-ear (OE 2018) target; estimate, treat as a starting point)
Preamp: -9.4 dB
Filter 1: ON LSC Fc 105 Hz Gain 9.1 dB Q 0.70
Filter 2: ON PK Fc 40 Hz Gain 0.0 dB Q 2.00
Filter 3: ON PK Fc 90 Hz Gain -1.6 dB Q 1.40
Filter 4: ON PK Fc 180 Hz Gain -0.4 dB Q 1.40
Filter 5: ON PK Fc 375 Hz Gain 0.4 dB Q 1.40
Filter 6: ON PK Fc 750 Hz Gain 0.3 dB Q 1.40
Filter 7: ON PK Fc 1500 Hz Gain 0.3 dB Q 1.40
Filter 8: ON PK Fc 3000 Hz Gain 3.0 dB Q 1.40
Filter 9: ON PK Fc 6000 Hz Gain 3.5 dB Q 1.40
Filter 10: ON PK Fc 10000 Hz Gain 3.6 dB Q 2.00

GraphicEQ line (EqualizerAPO)

Preamp: -13.6 dB
GraphicEQ: 20 13.3; 27 10.8; 36 9.0; 47 7.4; 63 6.1; 84 4.4; 112 3.0; 150 1.2; 200 -0.2; 267 0.1; 356 0.4; 474 0.6; 632 0.8; 843 0.6; 1125 0.1; 1500 1.4; 2000 1.5; 2667 2.0; 3557 4.6; 4743 8.2; 6325 2.0; 8434 4.1; 11247 4.0; 14998 1.4; 20000 -7.6

How this format loads

EqualizerAPO: the .txt goes in your config folder and is included from config.txt (the parametric filters apply system-wide on Windows). Wavelet and most DAPs accept the same band table typed into their parametric EQ: same frequencies, same gains, same Q. Preamp exists so the loudest boosted band cannot clip.

Facts on this page come from the measured curve on file; the target curve and the fit are approximations. Nothing here is a recommendation to EQ - it is the preset, labeled, for people who already EQ.