400w 2*200w Stereo Hifi Car Home Subwoofer Car Sound Audio Amplifier Amp Sound Speaker Digital Edr Audio Led Design Amplifiers - Home Theater Amplifiers - AliExpress
Monoprice SWA-400 400-watt Subwoofer Amplifier with DSP and Presets - Monoprice
MTX Subwoofer Kit 12-Inch 1200 Watt 400 Watt RMS Sound System with Amp & Wiring | eBay