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Alpine Type S SWS-12D4 12 Inch 1500 Watt Max 4 Ohm Round Car Audio Subwoofer - Walmart.com
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Amazon.com: Universal Car Stereo Vented Port Single 12" Alpine S-W12D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New Without Amp : Electronics
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ALPINE SWS-1242D 12" Dual 4 ohm Type-S Series Car Subwoofer. Tested works. Used | eBay