Plena System Pre-Amplifier

Plena System Pre-Amplifier??? Six-zone system pre-amplifier, with single or dualchannel operation??? Two input channels for call stations??? Universal input for microphone/line, with speechoptimized tone control??? Three inputs for BGM selection and music optimizedtone control??? Front panel zone selection for BGM and call stationzone selection for calls??? PC and trigger inputs for automated calls, alarm tonesand chimes to selected zones