JL Audio 12W1v3-4 W1v3 Series 12" 4-ohm subwoofer at Crutchfield
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STLF-18120A | 18" Cast Aluminum Frame High-Power Raw Woofer Speaker, 5 – Sound Town
SVS 12" 550W Powered Subwoofer Premium Black Ash SB-2000 PRO -BLACK ASH - Best Buy
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Skar Audio VD-12 D2 800W Car Subwoofer for sale online | eBay
Dayton Audio PSS555-8 21" Pro Subwoofer with 4.5" Voice Coil 8 Ohm
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