Hi all: I just installed my all-Klipsch 5.1 system (RB-81-Mains, RC-62-Center, RW-10d-SW, and 5650-S-Surrounds) and was reviewing my receiver (Denon 2807) manual and saw that I can take my unused Surround Back amp and "Bi-Amp" my front main speakers, if I chose to. The manual says this would...