Bosch LBB1925/10 audio preamplifier

The Plena system pre-amplifier is a versatile high-performance unit with call and mono BGM (background music). It fulfills a wide variety of public address requirements at a surprisingly low cost. It can provide dual channel operation for simultaneous calls and BGM for up to six different zones using two Plena amplifiers.

???Six-zone system pre-amplifier with single or dual channel operation
???Two input channels for call stations
???Universal input for microphone/line with speech optimized tone control
???Three inputs for BGM selection and music optimized tone control
???Front panel zone selection for BGM and call station zone selection for calls