Can you dial out the treble if you turn the direct
signals to zero?
In Stereo mode...using just the left filter...If you have the settings at :
Direct Gain- 0
Filter Gain- 6
Freq- 100hz
Damping ratio- 4
Filter type- LP
...does this produce lots of bass and no treble?
I'd then test the right filter with the same settings.
I'd then switch to mono mode, turn the channel 2(right side) filter gain to zero.
Blend in some dry with the bassy signal in channel 1.
Bring up channel 2 filter gain and find a complimentary freq area to blend.
hope this helps troubleshoot some,
elwood
p.s. Is there a built in x-over in the cabs?