Part 24 of the European Union’s (EU) EN 54 standard for fire detection and alarm systems has a specific requirement for voice alarms, which output messages in the form of a voice message rather than a traditional siren. The following JBL PD500 Full Range (in full-range mode) Loudspeakers are certified to meet the stringent requirements of a life safety system to serve the needs of hospitality, large venue and other markets.