Quote Originally Posted by DaveM View Post
OK, so what is On/Off thump? Will it damage something if I connect the radio and amps to a separate switch, and not the ignition?
Lets break this in to 2 parts

Turn on/off thump is usually created when the amp(s) and main source unit are turned on or off at the same time, like wiring then to the same switch. Rarely will it damage anything, but darned annoying.

I highly suggest relocating the head unit's IGN turn-on from the key switch to the rocker. leave the turning on of the amps, to the head unit.