I am guessing that you are looking for that satisfying ummmph the movie creators feed to good subs. IF that is the case, go with the 600 or the two 500s. I have a single 500 in the bonus room. It has a knee wall up to about 4 feet then a 45 degree slope to an 8 foot ceiling. 18 feet wide by 25 feet long. IF I were to crank the one 500, it would likely boom the pictures off the wall. I don't - I keep it even for music listening - but the LFE feed still gets down there on the Action Adventure movies.

"A fanatic is someone who can't change his mind and won't change the subject" Churchill