Loud hum when turning car off

seabiscuit70

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I’ve got a 1500 watt amp and 2 kicker 12” subs that play a loud hum when I turn the car off. This note plays during the time between the engine shutting off and the amp getting cut off. ALSO: I noticed that if I unplug thr RCA from the amp, this does not happen. What might be the issue?
 
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seabiscuit70

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