If you have a rectangular room is it better to set up the system by width of the room or have the depth between the couch and the screen? By width I mean I would have mor4e room for speaker placement up front by depth I mean I could move the couch forward and have room for a sixth speaker in back. The room is not perfectly squared and is longer in one direction. Hope this makes sense and thanks for any help. Just got my new csi5 front center and am ready to get busy with it.