...or at least that is what the salesman told me at a well known shop here in town. I was told that I needed an "active" sub because my room is too bright, with hardwood flooring, big windows and a high ceiling. He said that the 12" HSU I was considering would be really difficult to place in the room. He recommended a forward firing sub instead. I always thought that low frequency sound waves didn't reflect too badly off most surfaces!?! Are certain types of subs better suited for bright rooms? The room is 17'X 25' with 20 foot ceilings. Can any one 12" sub fill 10,000+ cubic feet?