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It was just to make sure that all the equipments in the audio chain is working properly.

For eg live sound, when you tap the mic and if the loudspeaker reproduce the tapping sound then you can make sure that all the equipments in the chain is working properly,your mic,amplifier,loudspeaker etc

But i just want to tell you one more thing that tapping the microphone is not a good practise as it may spoil the diaphram.

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17y ago

What else can I help you with?