Right @oldhvymec, Danny Richie of GR Research always uses four subs, both at hi-fi shows and in the system at his place. A pair of ob's somewhere in the front of the room, and a pair of sealed subs (the F12G) in the back. His room was voted Best-Bass-At-The-Show at numerous RMAF's.
Subwoofer question
I read in an older thread in which someone was describing how a "swarm" sub system was being installed, that the individual subs were placed close to the wall and facing the wall. This last part triggered my question which is:
What is the rationale behind facing the subs toward the wall?
Many thanks, Fred