Audio System X15-1100 12" 550 Watt Dual-4-Ohm Kevlar Car Audio Subwoof - Showtime Electronics
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Amazon.com: Pyle 8-Inch Low-Profile Amplified Subwoofer System - 600 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs PLBX8A : Electronics