I keep scratching my head. I have a 6'000+ cubic foot room (really big). I can't figure out how my 12" 250 watt sub is filling the room or at least according to my SPL meter. I do have it located so it is getting good boost from a wall and floor, but it still doesn't make sense. Everyone seems to say that a sub this size way too small for my size room, but the SPL meter does not agree. My ears say it is barely adequate.