Why do some microphones screech? And why do the ones at big events like award shows not screech?
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The screech is called feedback and it often happens when a microphone is placed in front of, or too close to, the speaker where the sound picked up by that microphone is coming out. It’s like a repeating loop, where the microphone picks up the sound already coming out of the speaker which then produces more noise. This happens again and again almost instantly, so it gets louder and higher and more unpleasant. At awards shows, the mics are usually either fixed in place or the speakers are well in front of the stage so there’s no chance for them to get too close to each other.
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