Feedback

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Feedback is when a certain amount of the output goes back into the input. In live sound, it's often a certain frequency which is fed back to the microphone(s), which in turn can lead to a squeak. This can happen on any frequency and what triggers it can be something very weird. A listening wedge of the monitor engineer on a festival which is reflected by the tent to the singer's microphone and thus giving a loud squeak.

Sound engineers are not appreciative of feedback and prefer to have none. This can give some difficulties in handling them, so if you like to make suggestions about a recent event, don't call it feedback to them, or they'll cover their ears straight away!

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