yeh, I think my room would be 2400 cf so one would be enough , but I hate the fact of one. I guess I need to place it better in the room just I like if a bomb explodes on the right side of my screen I want to hear that it originates from the right. but then I need decoding and a amp that sends mono signals to the right sub channel only. And I know low frequencies are omni directional blah blah blah. But put it this way if you are walking down a street in say ... whatever town and you were blind folded and a bomb goes of on the right side of the road. you can tell it came from your right you don't hear the low end all around you it comes from the right and you can tell hence left and right channel subs. And I want a sub ( two EP600's be good ) that when the bomb in Behind Enemy Lines goes off to my right to actaully shake the shirt on me from the lower 12 hz of air movement I want to feel and hear the wind go by from my right to the left