18 en | Operation PLENA Mixer amplifier, 4-zone, 240W
2019-03 | V1.1 | Operation manual Bosch Security Systems B.V.
However, telephone/ 100V emergency announcements are always routed to all zones,
irrespective of the position of the zone selection buttons.
7.5.2 Master volume control
Use the master volume control knob (6) to collectively control the sound level of all outputs,
except the emergency announcement/signal.
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