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Public address loudspeaker installation

one or several loudspeakers (usually horn loudspeakers) used in a stationary installation (on the street, at a railway station, in a stadium or at some other place)

Pronunciation
/ˈpəblɪk ˈæˌdrɛs ˈlaʊdˌspikər ˌɪnstəˈleɪʃən/
/ˈpʌblɪk əˈdrɛs laʊdˈspiːkə ɪnstəˈleɪʃən/