Gonk, once again you were right. Changing the fronts to small (this forces the 990 sub trim to "yes") made a significant difference in 2-chnl audio playback. I like it! Good thing I tried all these new settings before moving anything around!! That would've been a nightmare. Now I'll try tweaking the center and surround crossovers as you suggested. I'll let you know this evening how it goes.

Thanks again.