Rockville W65K9D4 6.5" 1000w Car Audio Subwoofer Dual 4-Ohm Sub CEA Compliant
Amazon.com: Massive Audio SUMMOXL104-10 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 10" Subwoofer 1500 Watt RMS, 3000w MAX Dual 4 Ohm, 3 Inch Voice Coil. Sold Individually : Electronics
Amazon.com: Audiopipe APSB-1299PP Dual 12 Inch Car Audio Subwoofer Speakers and Sealed Enclosure, 2 Channel 500 Watt Amplifier, and Wire Installation Kit : Electronics
55 Series 15" 2Ω Dual Voice Coil Subwoofer | MTX Audio - Serious About Sound ®