Charles, I'm currently using a Rotel 2 channel amp to drive the 4 ohm 80s (fronts) via the pre-outs on an H/K 635 with the 635 driving the center and surrounds. I'll also chime in and say that *IMO* it is quite an improvement over the reciever standing alone. It is doing the job fine untill I go seperates for everything.

Rick
Our Room

smile