process of elimination during power on/off key sequence when you hear the noise:
#1. Turn down volume of radio.
#2. Turn off Radio
#3. Disconnect preamp out from radio from amp.
#4. Disconnect power amp trigger wire from radio.
After that I'm not sure. If you have any active electronics running between the amp and the head unit I would suspect that.
Is your H/U running the power/speaker outputs into the amplifier instead of the low level preamps?
Is the H/U switching to AM/FM during this time?
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