Yamaha DXS12mkII 1020W 12 inch Powered Subwoofer | Sweetwater
Amazon.com: Pyle 8-Inch Low-Profile Amplified Subwoofer System - 600 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs PLBX8A : Electronics
Wet Sounds Stealth AS-10 Marine powered subwoofer — sealed enclosure with 10" sub and 500-watt amplifier at Crutchfield