loudspeaker
speaker ***
speaker unit
loudspeaker system
speaker system

Someone suggested it had something do with the speaker system.

A. It doesn't just have something to do with the speaker system.

That is what you notice right off with this speaker system.

The answering voice comes through the car's built-in speaker system.

"There is a speaker system in the wall," he explained.

I'll leave you two heroes to fight it out while I have a word to the men over the speaker system.

When fed up with his job, he goes inside and starts singing on the speaker system.

The light stayed on, blinking, and another question came over the speaker system.

It was as if someone had pulled the plug on the speaker system.

A speaker system had been hooked up so that everyone could hear.