Amazon.com: Pyle Car Subwoofer Audio Speaker - 8in Non-Pressed Paper Cone, Black Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 800 Watt Power and Foam Surround for Vehicle Stereo Sound System -
Alto TS 18S Subwoofer – Thomann United States
Elite 15" Subwoofer | Car Audio Equipment | American Bass