public-address system


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public-address system

a system of one or more microphones, amplifiers, and loudspeakers for increasing the sound level of speech or music, used in auditoriums, public gatherings, etc.

sound-amplification system

A combination of one or more microphones, amplifiers, loudspeakers, and associated electronic controls; used to increase the level of a sound source so that it may be heard clearly in all parts of an auditorium, large room, open-air theater, etc.
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