Amazon.com: PIONEER TS-WX130EA Pre-Amplified Active Subwoofer, 160 W : Electronics
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
Amazon.com: PIONEER TS-WX1210AM - Powerful 12-inch Active Subwoofer with Built-in Amplifier, 1300 Watts Peak Power, and Compact Design for Deep Bass : Electronics
Amazon.com: Pyle Car Vehicle Subwoofer Audio Speaker - 10 Inch Red Electro-Plated Cone, Red Plastic Basket, 1.5” Kapton Voice Coil, 4 Ohm Impedance, 600 Watt Power, for Vehicle Stereo Sound System - Pyle PLW10RD : Electronics