ANSWERS: 2
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is the amp bridged mono? check first if not switch wires see if same occurs if sub was blown you would know it internal wires might have loose connection
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a wire might have come disconnected. if it is blown you would hear some really bad noise comming from the sub. are they in a seal box or a hollow box. better if they are in a sealed box so that they are not fighting each other for the air pressure and one of them blowing because of it being the weaker one. just check to make sure all wires are connected tightly. check from sub to inside box terminal. from treminal to amp.
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