not clicking or popping (99% sure, last time i listed to it was 8hrs ago), amps are grounded to a battery (Hc800). But it might be the RCA issue. Ill try and get a vid of what it sounds like to get a better idea. But that will be in about 10hrs.
im just trowing out ideas but hopefully you can get a good 100% diagnosis of what it sounds like or is and can get it fixed