loudspeaker
US /ˈlaʊdˌspiː.kɚ/
UK /ˈlaʊdˌspiː.kɚ/

1.
altoparlante
a device that converts electrical signals into sounds, typically as part of a public address system or sound reproduction system.
:
•
The announcement was made over the loudspeaker.
L'annuncio è stato fatto tramite l'altoparlante.
•
We need to connect the microphone to the loudspeaker for the event.
Dobbiamo collegare il microfono all'altoparlante per l'evento.