Amazon.com: Lanzar 8in Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Stamped Steel Basket, 4 Ohm Impedance, 600 Watt Power and Rubber Suspension for Vehicle Audio Stereo Sound System - MAX8 (1 pack) : Electronics
Pyle Pltab122 12 Inch 600 Watt Enclosed Carpeted Cylindrical Tube Vehicle Car Audio Subwoofer Speaker Sound System With Built In Amplifier : Target
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
Best Buy: JBL 12" 600-Watt Powered Subwoofer L8400P
Javelin Series Single 10" 600 Watt Loaded Car Subwoofer Enclosure - Po | Audio Legion
8" Subwoofer 600w Dual 2 Ohm Pro Car Audio Cadence Ultra Shock US8D2 for sale online | eBay
Pyle 12 Inch 600 Watt Mount Car Audio Subwoofer Enclosure Box System With Rear Vented Design And Led Lights For Trucks, Outdoors, And Parties : Target