Bosch Security Systems | 2007-10 | PLE-2MA120-US, PLE-2MA240-US en
Plena Mixer Amplifier | Installation and User Instructions | Connections and settings en | 23
4.3 Unit settings

4.3.1 Rear panel settings

The unit can be quickly set-up for operation by setting
the following controls at the rear of the unit:
• DIP switches
• Rotary dials
• Master switch for line out or music only.
See the following tables for an overview of the settings
and typical examples of their use.
table 4.1: DIP switch settings
DIP switch On Off Typi cal exam ple (On )
Chime
(mic/line 1)
Chime will be sounded at the
beginning of an announcement.
Chime will not be sounded
at the beginning of an
announcement.
Announcement of train
departure time.
PTT “Push to talk”
(mic/line 1 only)
This input is muted when the push
to talk contact is open. When the
push to talk contact is closed:
• this input is available for
speech.
• a chime will sound, if selected.
• the music and other mic/line
inputs will be reduced in
volume to the level set by the
ducking level control knob.
Push to talk off. The signal
will be mixed with the other
mic/line signals.
Microphone 1 will mix with
the background music or
the other microphones in
the selected zones.
Users can have private
conversations during live
broadcasts (for example,
with an all call call-
station, such as the
PLE-1CS).
Line Input signal from line. Input signal from
microphone.
Depends on set-up.
Speech filter Enhances clarity of speech, by
cutting-off the lower frequencies
of the signal.
Speech filter inactive. Use for announcements
Phantom power Provides power to condenser
microphones.
Phantom power
unavailable.
Enable phantom power if
you use electret or
condenser microphones.
VOX
(mic/line 2 only)
Temporarily suppresses the
background music to an
adjustable “ducking level” (see
table 4.2) while you speak into the
microphone. The VOX mode is
normally used with hand-held
microphones such as the
LBC 2900/15. Background music
and announcements will be heard
in the selected zones. A chime is
not available in this mode.
VOX inactive. Microphone
2 will mix with the
background music or the
other microphones in the
selected zones.
Use to make casual
announcements (such as
announcing the winner of
a competition) while
temporarily suppressing
the background music to
an adjustable ducking
level.