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Amazon.com: Pyle 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2
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DFS-9218 SUB Dual 18” Bass Passive/Non-Powered Subwoofer 3200 Watts | Better Music Builder
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SONY SS-WG99i Passive Non Powered Subwoofer Box Speaker Sub Bookshelf 4ohms BASS | eBay