SpeakerPower SP1-4000 Subwoofer Amplifier: Madisound Speaker Components, Inc.
Full Marty by GSG(TM) Flat Pack Subwoofer – GSG Audio Design
Dayton Audio SPA-F Subwoofer Plate Amplifier Mounting Frame for SPA250DSP and SPA500DSP
D1-1KD 1000W Class D Plate Amplifier Module for Subwoofer Bass - Buy plate amplifier for subwoofer, bass plate amplifier, subwoofer plate amplifier Product on Sanway Professional Audio Equipment Co., Ltd.