Sennheiser HD 650
Confidence: MEDIUM-LOW
Uses data from GRAS KB50xx, B&K 5128, B&K 4128, and HeadAcoustics HMSii.3
Preamp: -11.5 dB
Filter 1: ON PK Fc 20 Hz Gain 5.7 dB Q 1.000
Filter 2: ON LSC Fc 80 Hz Gain 2.0 dB Q 0.700
Filter 3: ON LSC Fc 110 Hz Gain 4.0 dB Q 0.700
Filter 4: ON PK Fc 120 Hz Gain -2.3 dB Q 0.600
Filter 5: ON PK Fc 240 Hz Gain -0.9 dB Q 0.700
Filter 6: ON PK Fc 615 Hz Gain 0.5 dB Q 1.400
Filter 7: ON PK Fc 1350 Hz Gain -0.7 dB Q 1.800
Filter 8: ON PK Fc 2150 Hz Gain 0.8 dB Q 1.500
Filter 9: ON PK Fc 3333 Hz Gain -1.5 dB Q 2.000
Filter 10: ON HSC Fc 4000 Hz Gain 0 dB Q 0.700
Adjust band 3 for overall bass
Adjust band 10 for overall treble
Please be advised that pad condition and positioning matters greatly for this headphone, which is why I didn’t touch any of the treble. Feel free to add an additional peak filter somewhere in the 6-12 kHz area if you find its too dark or too bright.