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Amazon.com: Alpine Bundle Compatible with Universal Vehicles S-W12D4 Single 12" Loaded Sub Box Enclosure : Electronics
Alpine Car Audio Systems 800W 12" bandpass subwoofer in custom enclosure 7427282664141 | eBay
Alpine Type R 12 Inch 2250 Watt Max 4 Ohm Round Car Audio Subwoofer | R-W12D4 - Walmart.com
Amazon.com: Universal Car Stereo Vented Port Single 10" Alpine S-W10D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
Alpine R2-W10D2 10" 750w Dual 2-Ohm Car Audio Subwoofer+Sealed Sub Box Enclosure - Rockville Audio