A public address system amplifies and distributes audio across a building or outdoor area through ceiling speakers, wall-mounted speakers, or horn speakers. The source can be a microphone, a paging phone, a VoIP desk phone, a wall-mounted call station, or an automated alert system.
Common uses in Chicago commercial properties:
- Shift change announcements in warehouses and manufacturing facilities
- Emergency alerts and evacuation instructions
- Visitor notifications (“John Smith, you have a visitor at the front desk”)
- Safety reminders and operational updates
- Scheduled announcements (lunch breaks, closing time, facility reminders)
- Background music in retail and hospitality spaces
- School bells, class changes, and lockdown alerts
The system can cover the entire building with one message or send different messages to different zones. Warehouse offices hear different announcements than the warehouse floor. Retail back-of-house hears different pages than the sales floor.









