Rarely seen on its competitors, all microphone inputs have integrated speech filters and they are high-class transistor-balanced type, allowing good control of hum and noise over long cables. He's able to drive 8-ohm or constant-voltage loudspeaker lines (50-70-100V). The amplifier has integrated radio, 4 microphone inputs, 4 selectable line sources and one emergency/telephone input. Mic input 1 is meant to be the main microphone paging input, for its signal can be fed via the front .” TRS phone