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
Focal Sub 600P Black 600 Watt Closed Subwoofer - Creative Audio
Amazon.com: Pyle 8-Inch Low-Profile Amplified Subwoofer System - 600 Watt Compact Enclosed Active Marine Underseat Car Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs PLMRSBA8 : Electronics