noun
public-address system; PA system
A device or set of equipment used to amplify sound so that announcements or speech can be heard over a wide area.
学校の拡声装置で朝礼の連絡を流した。
The morning assembly announcements were broadcast over the school's PA system.
駅の拡声装置から列車の遅れが知らされた。
The train delay was announced over the station's public-address system.
Compound of 拡声 (かくせい, 'sound amplification') and 装置 (そうち, 'device, equipment').