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I was doing some testing today, by leaving the amp's remote lead connected to constant. It was done intentionally for testing only. So I turn off the car, open the door, POP. Close the door, POP. Insert the key, POP POP POP. Turn on the light, POP. When the car is ON, I mean ON, not even with engine is running, no POP on anything I do. Is it normal that the car has that much noise when it's off and get to the audio system that easy? Or I need to make a new ground to the radio? Will the POP that I usually unheard of (normally it's mute because I use remote turn on from radio) cause any problem to the input section of the amp in long run?

Edit: I cannot ground RCA, because the signal from radio to amp is differential balance.
 

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this is why you turn on amps last and turn them off first. HUs will have some turnon and turnoff thumps.
 

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I know some amps need a noise gate installed to stop this from happening. You might want to try that approach.
 
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