popping nosie help

[fatboyracing 10+ year member]

me and a friend installed a Amp and a sub in his car

sundown 1500 and 2 dd 3510s

When you turn the car off the sub makes a loud note right as the power goes off

I have seen this one other time in a car and it was a bad rca wire so we got a new one same thing any one have an idea

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