BFD. I am new, but hope my info helps, but if your situation is anything like mine, I'll *bet* you have room gain causing the really LLLOOOOWWWW stuff (20-30Hz) to be loud, and the higher stuff (50-100) to be really weak. Tame those peaks, and I'll bet you get closer to what your looking for.

Also, don't forget about that phase control for proper "blend" of bass from your mains and sub @ the cross over frequency range.

-Alan