AutoEq / EqualizerAPO preset for Sennheiser HD 400 PRO Headphones

Generated from this product's measured frequency response (source: AutoEq · Auriculares Argentina), 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 AutoEq CSV (Qudelix / Wavelet)

Parametric preset (AutoEq / EqualizerAPO format)

# Sennheiser HD 400 PRO Headphones - AutoEq-style parametric preset (measured: AutoEq · Auriculares Argentina)
# AutoEq-style parametric preset - TheTuningChoice (approximate Harman over-ear (OE 2018) target; estimate, treat as a starting point)
Preamp: -9.5 dB
Filter 1: ON LSC Fc 105 Hz Gain 9.2 dB Q 0.70
Filter 2: ON PK Fc 40 Hz Gain 0.1 dB Q 2.00
Filter 3: ON PK Fc 90 Hz Gain -1.8 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 1.0 dB Q 1.40
Filter 6: ON PK Fc 750 Hz Gain 0.2 dB Q 1.40
Filter 7: ON PK Fc 1500 Hz Gain 1.1 dB Q 1.40
Filter 8: ON PK Fc 3000 Hz Gain 0.0 dB Q 1.40
Filter 9: ON PK Fc 6000 Hz Gain 0.7 dB Q 1.40
Filter 10: ON PK Fc 10000 Hz Gain 2.2 dB Q 2.00

GraphicEQ line (EqualizerAPO)

Preamp: -13.6 dB
GraphicEQ: 20 13.3; 27 11.2; 36 9.2; 47 7.3; 63 5.6; 84 4.9; 112 3.1; 150 1.8; 200 0.8; 267 1.2; 356 1.2; 474 1.0; 632 0.7; 843 0.4; 1125 0.5; 1500 1.3; 2000 1.7; 2667 -0.2; 3557 0.8; 4743 0.8; 6325 -0.2; 8434 -0.4; 11247 2.7; 14998 -9.5; 20000 -24.7

CSV band table (phone-app EQs)

105,9.2,0.7
40,0.1,2
90,-1.8,1.4
180,0.4,1.4
375,1.0,1.4
750,0.2,1.4
1500,1.1,1.4
3000,0.0,1.4
6000,0.7,1.4
10000,2.2,2

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.

Qudelix-5K / 71: the CSV is the AutoEq interchange the app's EQ import accepts - open the EQ screen, import/paste, and the ten bands above land as parametric filters (connect the app to the dongle first). Wavelet (Android): the same CSV feeds its parametric-EQ import; on setups without import, the band table above is short enough to type in by hand. Menu names move between app versions - the numbers stay the same.

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.