new loudspeaker on a white wall. megaphone hanging on the ceiling, vintage speaker for announcements and music

advertisement alert amplifier announce announcement announcments attention audio background broadcast broadcasting bullhorn ceiling closeup command communication control device electric emergency event gray hanging horn information journalism loud loudhailer loudspeaker media megaphone message metal music new old powerful promote public retro rules safety scream shout single sound speak speaker speech system technic technology trumpet vinage vintage voice voices volume wall white