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
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