As a powered subwoofer for your car, the Blaupunkt Velocity 2Go installs easily and delivers a reasonably powerful bass thump. But this sub gives you more bang for your buck in that it works as a semiportable speaker system for an iPod or other MP3 player. In the latter incarnation, it adds pairs of 6 1/2-inch woofers and 1-inch tweeters to its subwoofer output.
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