Amazon.com: BESTISAN Powered Subwoofer, 6.5" Active Home Audio Subwoofer in Compact Design,LFE & Stereo Line Inputs & Audio Output, Built-in Amplifier for Home Theater/Receiver/TV/Speakers, Black, SW65D : Everything Else
Rockville RVB10.1A 10 Inch 500W Active Powered Car Subwoofer+Sub Enclosure Box - Rockville Audio
Pioneer TS-WX1210A - Sealed 12" 1,300-Watt Active Subwoofer with Built-in Amp - Walmart.com