Pyle 10” Slim Marine Subwoofer - 400W 4 Ohm Waterproof Car Component Speaker System (Black) - Walmart.com
Amazon.com: H YANKA SODA-08ASW 400W 8 Inch Compact Underseat Car Subwoofer with Built-in Amp, Slim Powered Subwoofer for Car/Truck/Jeep Audio : Electronics