Amazon.com: Skar Audio EVL-65 D2 6.5" 400 Watt Max Power Dual 2 Ohm Car Subwoofer : Electronics
Amazon.com: DS18 Elite-Z ZR6.2D 6.5" Car Subwoofer 600 Watts Max Power Dual Voice Coil 2-Ohm Easy Mounting - High Performance Bass for Your Vehicle Sound System (1 Speaker) : Video Games
Amazon.com: Skar Audio EVL-65 D2 6.5" 400 Watt Max Power Dual 2 Ohm Car Subwoofer : Electronics