gonk I agree after auto setup I set the xover and been playing with the other settings. My front L/R speakers are bi amped with active xover top ones starts at about 100hz, bottoms are sub's. At first I had very little bass but as played around with settings the 990 came alive with bass. I mean the kind that thumps your chest, chair, walls and rattles the doors of the Franklin fireplace. All 10 of my speakers are horns and don't need much power -20 volume is close to being painful. In hind sight the first thing to do is use balanced cables. It would have saved weeks of trouble shooting. Now I can put my ear up to the speaker and dead quite.
AvFan the last thing I did was balanced cables and all is quite, at least I know I have no ground loop or ac or other problems the hard way.