I have an Onkyo NR5007 receiver and currently have it wired as 5.1. For the rears, I have the speakers set on the side, like the manual says. I'd like to add two speakers for "behind" the listening area for more fill. Right now, the side speakers sound more like on the side, than surrounds.
My thinking is that if I add a "back left" and "back right" speaker to the setup, I will get more rear fill. However, will the receiver use these two speakers, in addition to the ones on the side? I think it will, but after going through the manual, it sounds like it might not.