Best Big Sub? or duals?


I just moved and my HT is a 25 x 30' room in the basement with concreat floors. My current sub a vandersteen is to musical and just not big enought to have any effects, I also have a 15" velodyne that just about cuts it but doesn't really shake the room and the sweet pot is to narrow, probably because of lack of power my old house this did great in. I am using all vandersteen speakers so they are really fast I need a good fast sub or two that will shake the room. Any sugestions cost is not a big issue just want to do it right and don't want to spend more than I have to.
programmergeek
Check out HT Shack subwoofer Tests. Look for low group delay, high SPL output (without compression) and low distortion. (If you want audiophile music quality then THD less than 1% is a worthy goal but near impossible to find in most commercial subs)
I am not concerned with music as much with HT. I am running vandersteen 5a with two 12" built in subs in the main speakers. They are increable and rock the room for music. I need more something for effects and i do listen to some dts music dvd's so it can't be all movies. But I want to feel explosions in movies.
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