poping sound

ok ever since i upgraded my big 3 i get a popping sound when the volume goes to 0 and when the cars turns off i get a popping sound. the rca's are seprated like the power wire is all on one side and the rca on the other side. would a ground looping isolater work.

My older setups always did it, i just forgot about it but in the blazer i havent really heard it at all. Usually you use a GLI for interference. I know some amps and HU have anti thump turn on protection.

thank you thats what i figured but didn't want to send the money if that would not work.