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Amazon.com: Universal Car Stereo Slotted S Port Single 8" Alpine S-W8D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
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Amazon.com: Alpine MRV-M500 Amplifier and a R-W12D4 R-Series 12 inch Dual 4 Ohm Subwoofer - Includes wire kit : Electronics
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Amazon.com: Alpine (2) S-W12D2 Car Audio Type S Series Sub 1200W Peak 12" Subwoofer Bundle with Harmony HA-A800.1 Amplifier & Amp Kit : Electronics