Amazon.com: Pioneer TS-A300D4 12 Inch 1500 Watts Max Power Dual 4-Ohm Voice Coil A Series Car Audio Stereo Subwoofer Loudspeakers / Free Alphasonik Earbuds : Electronics
Pioneer 160-Watt Subwoofer with Built-in Amplifier TS-WX130DA - The Home Depot
PIONEER TS-WX70DA Space Saving Class-D Active Subwoofer with Bass Control (200W).