This is just a thought, what gauge wire are you running to your amp? The more current that passes through a wire the higher it's resistance becomes therefore dropping voltage across the wire and ultimatley not allowing your amp to perform as it should.
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This is just a thought, what gauge wire are you running to your amp? The more current that passes through a wire the higher it's resistance becomes therefore dropping voltage across the wire and ultimatley not allowing your amp to perform as it should.