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Dynamic range compression
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=== Public spaces === Compression is often applied in audio systems for restaurants, retail, and similar public environments that play background music at a relatively low volume and need it compressed, not just to keep the volume fairly constant, but also to make quiet parts of the music audible over ambient noise. Compression can increase average output gain of a [[Amplifier|power amplifier]] by 50 to 100% with a reduced dynamic range.{{citation needed|date=May 2020}} For paging and evacuation systems, this adds clarity under noisy circumstances and saves on the number of amplifiers required.
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