BassPro SL | Powered, 8" (200mm) car audio under seat woofer system
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JBL Stage 810 8" Car Audio Subwoofer - Walmart.com
JBL STAGE1200S Single 12" Car Audio Subwoofer Sealed Enclosure - Creative Audio
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JBL Stage A120P Powered subwoofer at Crutchfield
JBL GT5-2402BR Ported enclosure with two 12" GT5 subwoofers at Crutchfield
Amazon.com: PyleUsa 10-Inch Low-Profile Amplified Subwoofer System - 900 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs - PPLBX10A :
JBL GT-BASSPRO12 - Superior 12 Inch Ported Powered Car Subwoofer - Amplified sub boxes - Online Car Audio & Stereo Store