Review on Sound Storm EV4.400 Evolution Car Amplifier - 🚗 400 Watts, 4-Channel, 2-8 Ohm Stable Class A/B, Full Range by Mark Fleming

I had the same noise as everyone else. I connected a surge protector to a 12V power supply, it still makes noise. I put the filter on the 12V power switch, it still makes noise. I put the 12v radio switch on top of the filter. All noise was gone, the amplifier amplified the radio noise that was not audible before installing the amplifier https://www.amazon.com/gp/product/B07NPF6KVL/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1