I have searched the forums and only found tangential information on the topic I am researching. I apologize if my search query did not catch this question. I currently have a 5.1 speaker setup. I am adding two rear surround channels for a 7.1 setup. My problem is, my sofa is placed against (directly against) the long wall in a 13"X 22.5" room. My side surrounds are mounted 90 degrees a tiny bit forward of the listening position. My rear surround position must be compromised because my sofa is against the wall. Should I place the surrounds about 48" apart, near the ceiling pointing down, or towards the opposite wall? Would I be better off with only 5.1? If I only use 5.1, I can use the remaining amp channels to biamp from front l/r speakers so this isn't all a waste. I would really like to hear from people who have a similar setup, but any input is appreciated.