Image result for double equalizer dbx specs
dbx 231s dual-channel 31-band equalizer features at a glance:
1/3-octave constant q frequency bands.
Switchable boost/cut ranges of +/-6 or +/-12db.
12db/octave 50hz low-cut filter.
Front panel bypass switch.
+/-12db input gain range.
4-segment led ladders for monitoring output level.
Xlr and trs inputs and outputs