Excellent speakers and receiver. If the M22s were closer to the wall than they would be when on stands the bass frequencies would get some added support and be a bit more prominent.
As to whether using back surrounds in a 7.1 setup would be significant, it isn't the size of the room that's the determining factor. It's the distance available behind the listening position for a rear sound field to be experienced. If say at least 4' were available in a small room there would be some benefit, and in a relatively large room if the couch was right up against the back wall there'd be no advantage.
Edit: Yes, if the space is available, a vertical center speaker should be considered.
Last edited by JohnK; 01/12/12 03:19 AM.
