Pioneer TS-WX130DA Compact 8 x 5.25 Inch160-Watt Active Subwoofer with Built-in Amplifier - Black - Walmart.com
Amazon.com: PIONEER TS-WX1210AM - Powerful 12-inch Active Subwoofer with Built-in Amplifier, 1300 Watts Peak Power, and Compact Design for Deep Bass : Electronics
Boss Car Amplifier & Pioneer Subwoofer - auto parts - by owner - vehicle automotive sale - craigslist
Amazon.com: PIONEER TS-WX400DA Compact Series 9" x 5-1/2" - 250 W Max Power - Compact Active Subwoofer,Black : Electronics
Amazon.com: PIONEER TS-WX1210AM - Powerful 12-inch Active Subwoofer with Built-in Amplifier, 1300 Watts Peak Power, and Compact Design for Deep Bass : Electronics