I am getting ready to install some speakers into my basement rec room which will be our home theater. The house was built and pre-wired for 6.1 and has boxes in the walls for the front 3 speakers and in the ceiling behind the seating area for the back 3 speakers. Without getting into the whole in-wall debate (due to pre-existing choices and extenuating circumstances too detailed to go into, I am using Klipsch R2650W's all around) would it be better for me to go from 6.1 to 7.1 if I can run another wire back to the receiver from the spot in the ceiling where the rear center channel is supposed to be placed (I have a conduit up there for the projector)? If not, how do you wire the 6th channel only on a 7.1 receiver? Also, since all the speakers are "square" which way should the rear speakers and rear center(s) be positioned? Should they all face the same way with the tweeters closer to the screen or sideways or what? Sorry if these are stupid questions, but I'd like to get my ducks in order before I start cutting drywall. Thanks for your help.