I keep hearing lots of references to room size. The SVS PCi series subs says it for small to mid size rooms. Reviews on the Outlaw 1070 say it's got a true 65 WPC which is plenty for small HT's. My problem is, I don't know how big my room is. I'm finishing the basement. The great room is about 15'x40'. I've got one end for the HT. My surround speakers will be about 17' from the front wall with the couch 1-2 feet in front of them. Would this be considered a small, medium, or large room?