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The high pass is 12 db/octave. You can try using the low eq band with a tight Q in conjunction with the high pass, I’ve seen it done with acceptable results to the operator, I haven’t found the need myself.

If you want to eliminate low frequency “gak”, use an aux-fed sub arrangement, this will elimimate any undesireds inputs from the subs completely.

Tim Tyler
Detonator Sound
Richmond, Va USA
T112/48 R72/32 laptop iPad Dir-815 Dante