Mcomb is right if you want a nice little sub enclosure i would recommend checking these guys out http://www.sasbazooka.com/

they have powered enclosers and non powered enclosers to fit all your needs i have 2 of the 8" tubes and they are pretty sweet for the price and they are easy to take in and out (for those off road trips)

hope this helps

shawn
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RIO CAR 60GIG (blue)