I've heard that local movie theatres have to have multiple subs. How many exactly? (and im talking about the big state of the art theatres...) I also heard they can't dip to such low frequencies as good home theatre subs. Is that true? I was looking in the klipsch website and found some theatre subs, man they're huge! i wonder how those would perform at home... http://www.klipsch.com/products/prod...p?id=190&line= also, where are they placed in a theatre? are they all behind the screen?