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			FYI, Clarion makes a unit (SRV303) that is a special 7" sub with a concentric magnet (in the middle of the speaker) paired with a built in 120W amp and adjustable crossover.  I have it mounted behind the passenger seat; it's only about 3" thick.  It's size lets it tuck in behind the seat in such a way that the passenger only loses about 1" of legroom (seat goes almost all the way back).  Sounds really good.
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