JBL PRX418S Passive, Unpowered PA Subwoofer Speaker (1600 Watts, 1x18")
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JBL Subwoofers
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JBL Power P1020D 10" Dual 2-ohm Component Subwoofer at Crutchfield
Amazon.com: Pyle 12' Car Audio Speaker Subwoofer - 1600 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 40 Ohm, 60 oz Magnet, 2
JBL ASB6128 High Power Dual 18-inch Subwoofer System | Sweetwater