... and EN54-24 Certificated Voice Evacuation System Class D amplifier for voice alarm system, 120W to ... .Balanced line input by phoenix connector and 100V line speaker output by phoenix connector.Built- ... on, overheat, short circuit and overload.Features* Class-D power amplifier for voice evacuation system* 120W, 240W ... , 350W & 500W by one, two and four channels* 19, , rack ...