I use Equlizer APO. it's working, how I know? because when I increase the filter dB to much I hear the changes but for the filter below I don't hear anything has changed.
Preamp: -8.5 dB
Filter 1: ON LS Fc 40 Hz Gain 5.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc...