We called it the PA. Back in the day when I was involved in organising and setting up parties and small concerts. (each about once a year). Not very accurate (looked it up just now) , but you might hear it referred to as such.
jeroentbt
joined 2 years ago
We've even been doing that for thousands of years!
This is so blown out of perspective!
/img pun, I'll get my coat
Best match I could find: https://en.m.wikipedia.org/wiki/Public_address_system