Each situation has its unique aspects. I had a hard time even figureing out how to add a sixth channel. Our listening position is on the couch backed up against the kitchen wall. I ended up putting the rear channel speaker on the floor facing straight up behind the couch against the wall. There is a bout a 2" slot between the couch back and wall where the sound comes to us reflecting off the wall behind our heads. Works suprisingly well. I don't know what a seventh channel could add.

Mark