1.   A new public address system will be installed and the cabs modified to suit driver-only operation.

2.   Selection of appropriate communication media, including the use of notice boards, paging devices and public address systems.

3.   The doors had come open and there was a voice on a public address system shouting something.

4.   There was a crackle of static, like a public address system at a church social, then another record started.

5.   A public address system magnifies all the little noises and coughs.

6.   Someone cranked up the volume of the public address system.

7.   The announcer on the public address system was desperately ad-libbing.

8.   Kevin switched on the public address system and shouted into it.

9.   There was a public address system for the music and her house was vibrating.