Amazon.com: American Bass 15" Competition Car Subwoofer, 3000 Watt Maximum Power, Bass Surround Speaker, Car Audio Stereo Subwoofer - 15 inch, Dual 4 Ohm Voice Coil : Electronics
Amazon.com: American Sound Connection 312H Universal Large Car Trunk Triple 12" Sealed Subwoofer Rear Angle 3 Sub Box Stereo Enclosure and S-W12D2 Type S Series Sub Dual 2 Ohm 1200W Peak 12"
American Audio KPOW15BT Replacement Speaker OEM Repair Parts #9685 | eBay
AMERICAN BASS HD12D2A-V2 12" 2000W RMS DUAL VOICE COIL 2-OHM CAR AUDIO SUBWOOFER 636823698416 | eBay
Amazon.com: American Bass Car Audio 12" Subwoofer 2" Dual Voice Coil 4 Ohm 600W XO-1244 : Electronics
PXW 15P Sub Woofer from American DJ for more punch in the bassline.