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Pin Settings And Labeling - Bosch PLENA Series Operation Manual

Mixer amplifier, 4-zone, 240w


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PLENA Mixer amplifier, 4-zone, 240W
Rotary knob
Ducking level control
Telephone / 100V emergency
input volume control
When PTT is selected, the ducking control ranges between 0dB attenuation (very little
ducking) to -∞dB (muted). Ducking also impacts the music level in the unselected zone(s).

Pin settings and labeling

Users can create custom labels for the microphone/line inputs, description of the music
sources, and audio output zones 1 to 4. These labels can be attached to the mixer amplifier at
position numbers 2, 3, and 5 (see Front panel, page 9). Colored pins can also be inserted at
various positions around control knobs to indicate the favorite settings for a particular
The pins are engineered in such a way that they cannot be taken out by hand. This is to
prevent tampering. The pins are intended to be inserted once, during installation of the unit.
The silver pins should be used to indicate the preferred settings of the unit. The red pins can
optionally be used to indicate the maximum setting of a knob.
If these settings have to be changed, use a pair of soft-tipped pliers to carefully remove the
pins. If you do not have a pair of soft-tipped pliers, you can use ordinary pliers instead, but
first place some plastic tape on the tips of the pliers to prevent damaging the front of the unit.
To remove the clear plastic covers in front of the labels:
To reattach the plastic covers with paper labels:
Bosch Security Systems B.V.
Carefully insert a small screwdriver into the cut-out at the bottom of the plastic cover.
Gently lift the cover, and bend it in the middle. Take care not to force the cover or the
front panel.
Sets the required ducking
level when Push to talk is
active (see table 6.5). When
the ducking level is set to
max (mute), the music
volume will be fully
attenuated; when the ducking
level is set to mix, both music
and speech inputs can be
Attenuates the emergency
announcement or signal.
Control range from -20dB to
0dB. For safety reasons, the
volume of the emergency
announcement or signal
cannot be fully set to zero.
Operation manual
Configuration | en
Typical example
Set the ducking level control
to mute or attenuate the
background music when an
announcement is being made.
Set the volume of the
emergency announcement to
a higher level when the
system is being used in large
open areas.
2019-03 | V1.1 |


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