I haven't followed this thread like I should, so you may have already done this, but I'd start out by calibrating the system in a surround mode (either using the internal test tones or a disc like Digital Video Essentials, AVIA, or GetGray) first, such that 5.1 content sounds right first. Then I'd dial in my sub for two-channel, looking at both front crossover and two-channel sub offset. Also, you might want to try more than one 5.1 concert disc to make sure your original setup is good. I was checking out one disc with another forum member (UMtiger) a few weeks ago, and we both found that the surround mix was very disappointing - no fault of the player, processor, amp, or speakers, but simply because the sound mix was weak. We were focusing mostly on the front soundstage (dialing in a few new speakers) and there was no sub present, but the same principle could apply here. In that case, using the stereo audio track was much more pleasing, and some other 5.1 music samples I brought along sounded fine.