loudspeaker
speaker ***
speaker unit
loudspeaker system
speaker system

That it should come over the loudspeaker system puzzled no one.

Mark's name had been called over the loudspeaker system.

But frequent updates over the building's loudspeaker system pushed the time back.

Over the loudspeaker system a woman's voice said, "The elevator is secured."

Additionally, the opera itself is played on more than one occasion, usually over a loudspeaker system.

The loudspeaker systems may be the state of the art, but on strictly musical terms they are lousy.

All the while, the loudspeaker system went on counting up to five and down to one.

Students there have already set up their own loudspeaker system to broadcast news and they are talking about starting a newspaper.

He said that noise levels would be reduced by the use of a new loudspeaker system.

Then, during shooting, he could talk to them from a loudspeaker system high on the cliffs.