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
PRX718XLF 18" Self-Powered Subwoofer System - National
Alpine 8" Powered Subwoofer System Black PWE-S8 - Best Buy
Amazon.com: Lanzar Low Profile Marine Subwoofer System - 1000 Watt 8 Inch Slim Active Waterproof Amplified Bass Speaker - Underseat Mount Audio Sound Amplifier Box, Marine Vehicles - Lanzar AQTB8 (White) :
Pioneer Sealed 12" 1,300-Watt Active Subwoofer with Built-in Amp in the Mobile Audio department at Lowes.com
Powered Subwoofers | Outdoor Speaker Depot
10" Car Audio Active Subwoofer 600W Ultra-Thin Speaker Installed Under The Seat | eBay