Rockville W15K9D2 15" 5000w Car Audio Subwoofer Dual 2-Ohm Sub CEA Compliant
Amazon.com: DS18 EXL-XX12.4DHE 12” High Excursion Car Audio Subwoofer 4000 Watts Dual Voice Coil 4 Ohms (1 Speaker) High Performance Big Bass Applications High Power : Everything Else