Voice evacuation systems are becoming increasingly common as more and more jurisdictions are requiring them in their fire codes. However, designing a system that has good intelligibility is much more difficult than simply using ordinary sounders.

Listed below are links to basic voice evacuation system design information.

Important Topics
- Relationship between Power and Sound Output

Listing Agencies Input
- A Word about Speaker Output ratings

Sound Pressure Calculator
- Sound Pressure Loss with Distance

Polar Plot Data for System Sensor Speakers.

Know if Your Design Meets Intelligibility Requirements with EASE