I am fresh to this forum and trying to build my HT. I've had the 640 for a few months and used it only for my casual stereo listening. I need some opinions. Should I keep this unit to power my HT and get a cheap stereo receiver to power my in wall Niles OR keep the Yam on the Niles and get a fresh HT unit. I am a fairly critical listener but haven't had a serious set up for some time. I tried to rig up the HT with the components I have but I am not satisfied with it one bit. I have a set of Infinity IL10's main, cheapy Infinity center (returnable), Velodyne DSL 3500 (probably to be taken back also) and old Bose AM5's on the rear. Advise me on the Yam and be prepared for more Q's on the speakers once this decision is made. I'm not afraid to spend a bit more than the $400 or so I spent on the 640 if the gains in performance will warrant it for the HT.