Hey Drew, I'm still a little off here. In regards to placing one speaker in the center of the back wall for 6.1, that would work just fine for your situation, a Q series speaker would be ideal as the 2 woofers and 2 tweeters would wrap you in sound. If your room is larger, you could even mount two speakers on that back wall for better REAR experience.
Where I'm confused is that you say the side windows, this would only affect the SIDE surrounds, that should be placed to the left/right of the listening position. So what are your plans for the side surround that will be on the side window side of the room? Are you using stands?
