Audio Notification System expander panels and modules provide an easy and cost-effective way to increase the output power of ANS25, ANS50 or ANS100 voice evacuation systems. Audio Notification System panels include an audio amplifier, temporal pattern alarm tone, power supply and battery charger. They can be ordered with or without a paging microphone and/or digital message repeater. Audio Notification System modules do not include cabinet, and are intended to be mounted in a UL Listed enclosure. The can be ordered with or without a a paging microphone and or digital message repeater. Voice evacuation expanders may be ganged together in any combination to provide up to 2,000 Watts of audio power.