I have a chysler 300 and I am using a lc2i off the back stock subwoofer for my input. It is going to a Hifonics brutus 2400 watt amp which is powering my two Shallow mount Skar audio 12's. When I shut off my car it is random but it will play a tone and it is full power. It shakes my whole house and I unplug the rca's to stop it. I dont know why it does this but if anyone else has had this happen and knows how to fix it then it would be much appreciated for any feedback.
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