The P1200A mainframe is housed in a 3 rack unit high, 19" rack mount enclosure. The mainframe incorporates power supplies for the controllers and mainframe electronics, two power amplifiers, softstart, monitoring and protection circuits with the associated indicators and all connectors. All functions can be remotely interrogated and altered via the d&b Remote Interface Bridge (RIB). Used with d&b C or E-Series loudspeakers, the mainframe can be fitted with either one loudspeaker controller module plus the mono option, or two loudspeaker controller modules. The two channel power amplifier in the P1200A mainframe is a low feedback, low distortion design, fully protected from damage by overheating or connection to faulty or inappropriate loads, and it exhibits good stability into reactive loads along with excellent handling of fast rise-time signals and signal overload conditions.