The preamplification circuit is provided with one Aux input for connection of an external sound source (CD player, etc.), and one input to process the signal from max. 3 desktop microphone units BMCP/A for priority call on sound source.
It is also provided with adjustment of input level of the Aux and Mic signals and with adjustment of output signal level, suitable for connection with lines of “SM” series amplified speakers.
It can power max. n. 20x10W or n. 5x20W powered speakers. For installations with a higher number of speakers additional A20/5 power supplies must be used. Made of painted metal, for wall-mounted or desktop installation.