This will be my first post on the Home Theater Forum. Before coming upon this forum, I always thought that Klipsch and JBL were the better subs out there. Thats until I read up on the SVS and then experienced it at my friend's place. Well my question is I'm debating between the 20-39 PCi and the 20-39 PC+. I watch about 90 % movies on my home theater setup. My living room with all openings accounted for is about 3300 cubic feet. Any suggestions would be great. Thank you. EDIT: The actual dimensions of the living room itself is 20' x 12.5' with a height of 8'. I just don't know how to account for the hallways and kitchen area.