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We tested the Velodyne Digital Drive Plus 18 subwoofer!
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Velodyne Digital Drive PLUS 18 Inch Subwoofer(black)(each) Velodyne Digital Drive PLUS 18 Inch Subwoofer BLACK - $4,352.00 : New Audio & Video, New Electronics at Lowest Prices!
Digital Designs DD Audio 9518 18" Subwoofer – South East Car Audio