Amazon.com: H YANKA BSF-15-2 15 Inch Subwoofer - 2400W MAX Power 15 Inch Paper Cone Subwoofer Car Audio, Black Aluminum Basket, 2.5“ Dual Voice Coil 2 Ohm Impedance 15 Subwoofer for Cars : Electronics
Amazon.com: American Bass XO 1044 10" 600w Car Subwoofer 4-ohm Sub+Mono Amplifier+Amp Kit : Electronics
Amazon.com: Audiosavings Bundle: Alpine RS-W12D4 12" 600 Watt RMS Shallow Car Audio Subwoofer Bundle with Rockville dB13 3000 Watt Peak/750w RMS Car Amplifier + Rockville RWK41 4 Gauge Car Amp Wiring Kit(3