BOSS Audio Systems P129DC Phantom Series 12 Inch Car Audio Subwoofer - 2600 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck Boxes and Enclosures, Hook Up To Amplifier - Walmart.com
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Power Acoustik MOFOS-12D2 12" 2500 Watt Car Subwoofer+Sealed Sub Box Enclosure - Rockville Audio
Sealed enclosure explained in detail and calculator - Audio Judgement