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Voltage that drives the speakers


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Hi Shaiq,
Audio is AC, not DC.
A microphone produces about 10mV AC. A preamp amplifies it to about 1V AC. A speaker power amplifier amplifies it to 20V AC for 50W into an 8 ohm speaker. These are RMS sine-wave voltages. Peak-to-peak voltages are 2.828 times more.

If you apply DC to a speaker then it will get very hot and maybe burn out. The DC will also cause its cone to move away from its linear center position causing severe distortion. ;D

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