... and EN54-24 Certificated Voice Evacuation System Class D amplifier for voice alarm system, 120W to 500W per channel ... circuit and overload.Features* Class-D power amplifier for voice evacuation system* 120W, 240W, 350W & 500W by ... PFC design, separate power supply and cooling system for each channel * Sleep mode automatically enabled ... 1.4A, 2A, 3A, 1.4A, 2.8A, 4A, 6A, 2.8A, 5.6A, 8A, 12A DC ...