78dB 500W 2CH Hifi Car Stereo Audio Amplifier Kit Subwoofer for MP3 MP4 Speaker | eBay
Rockford Fosgate Bass Package - Two R2D4-12 Prime 12" Dual 4-Ohm Subwoofers, A P500X1BD 500-Watt Punch Amplifier and a RFK8I Power Interconnect Kit - Walmart.com
DIYClassD Nilai500DIY 500W mono power amplifier kit
500W High Power Subwoofer amplifier board Heavy bass Audio AMP AC dual 24V - AliExpress