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A simple PA system consists of a microphone, an amplifier and one or more loud speakers. Those three components have a potential for feedback. Feedback occurs when sound from the speakers finds its way back into the microphone and is then re-amplified and sent through the speakers again. This generally manifests itself as a sharp, sudden shrill.

In colloquial British English, a PA system is often referred to as a " Tannoy" after the company of that name.

See also

• Sound system

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Topics: Public Address System Speakers Amplifier Microphone Feedback...

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