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A microphone, colloquially nicknamed mic or mike (/ËmaÉªk/), is a transducer that converts sound into an electrical signal.
To me, 'speak at the microphone' sounds like a public meeting. The guest speaker speaks, then the mc invites questions from the audience. One audience member has a loud voice and can be heard by everyone. Another has a soft voice and the mc invites him to come to the front and speak at the microphone.