The Silent Knight EVS-125W is an intelligent 125-watt amplifier for use with the 5820XLEVS or 6820EVS. The EVS-125W is used to amplify the audio message for distribution throughout the facility. Since it is designed as a self-contained distributed amplifier it can be conveniently located near the area of protection to reduce wiring demands.. The Each EVS-125W is capable of producing 125 watts of audio power. Up to four EVS-125Ws can be used on the voice evacuation system. The EVS-125W has its own power supply with battery backup and four speaker circuits which can be expanded to eight speaker circuits with the optional EVS-CE4. The EVS-125W is fully supervised by the main panel for trouble conditions.