Hi, I currently have a 5.1 system. My Rx will do 7.1, but I have been hesitant because I am unsure if my room's layout will accomodate the addition of 2 more speakers on the sides. The problem is that one side speaker will be further off to the side than the other surround speakers. The other problem is that the two new side speakers will need to be much lower than the ones in the rear. The rear's are 6.5' off the ground and the new side ones will need to be basically be right above the back of a couch and a lounge chair. The reason for this demanding lower heigth is because the couch is sitting in front of a window and if I go any higher it will be much more of an eye-sore than it is going to be already. PLEASE HELP!