Can confirm is the power amplifier problem! The amplifier has direct current going through the speakers that's what you're talking about.
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You first confirm that your audio amplifier is a single power supply or double power supply, look inside the largest capacity of the filter capacitor, if it is a single power supply, if it is two is a double power supply.
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If it's a single power supply, replace that filter capacitor.
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If it is a dual power supply, replace the signal input capacitor, and then replace the two filter capacitors with the same capacity.