Yeah, I was thinking just one back surround when I wrote 6.1. As for the distance, I have about 4' from the side surrounds, not from my sitting position. It's the way my room is laid out. The surrounds are slightly forward of my sitting position and I have a small wall to my rear, about three feet from my seat, for the back surrounds, which is about four feet from the side surrounds. There is the front door on one side and an opening to a dinning room on the other side.
M22v3;VP150;QS8;Hsu VTF3-MK4 sub