Value goes to the HSU. I would do 2 15's in that room, upfront near mains, possibly in center on front wall behind/near the center, run in mono (.1 channel). Better would be two Paradigm Servo 15's (musically even more accurate).
Other dual sub options available, obviously, (yes, I like dual subs for you, EQ'd, up front for best integration....FORGET THE SUBS AROUND THE ROOM TO SMOOTH RESPONSE WITH TODAY'S TECHNOLOGY - besides, it looks unsightly and cluttered around the room) but would likely run more for the quality. Earthquake dual 15's will run more, and not out-do the Servo 15's.
Did I leave any out?
Other dual sub options available, obviously, (yes, I like dual subs for you, EQ'd, up front for best integration....FORGET THE SUBS AROUND THE ROOM TO SMOOTH RESPONSE WITH TODAY'S TECHNOLOGY - besides, it looks unsightly and cluttered around the room) but would likely run more for the quality. Earthquake dual 15's will run more, and not out-do the Servo 15's.
Did I leave any out?