My previous set up had my QS8's on the back wall. I didn't like the fact that my couch was up against this wall also. Now my new setup allows me to have my couch centered in the room with the back walls about 7 feet away. My sidewalls will be approx. 5 feet away on each side of the listening area. Placing my QS8's on the side walls will allow the speaker to be approx 4 feet back from my listening area. Thus the delimma of sidewall vs. backwall placement. I'm right in the middle of that transition zone. I will probabbly try the sidewalls in this setup with speaker height at approx. 7 feet. Seems that the sidewall will be more forgiving than the back walls. Thanks for your reply.