Bosch LBB 1920 - Insertion and Cascade Modes

Bosch Security Systems | 2003-09 | 3922 988 99482en
Plena Universal Pre-amplifier | Installation and Operating Manual | en | 14
4.3 Insertion or Cascade connection
Figure 4.3 Figure 4.4
If you use the insertion or cascade mode, you must set the 'Ins/Casc' switch, on the rear, in the correct position.
The insertion mode can be used to connect an external sound-processing device, e.g. an equaliser. To increase the
number of input channels, you must use the cascade mode to link pre-amplifiers. E.g. with 2 pre-amplifiers, the
second preamplifier has 8 channels on its master output (4 channels from the first pre-amplifier and 4 channels of its
own).
4.4 Connect a Booster amplifier or System pre-amplifier
Figure 4.5
The master output and/or the direct outputs can be connected to a Plena Booster to amplify the signal to
loudspeaker level. You can also use the outputs to connect the universal pre-amplifier to the System pre-amplifier or
other equipment. The Master Mic output (DIN) has a priority relay contact on pin 4 and 5. This relay is activated
when a priority contact of one of the inputs is closed.
External settings and connections
0
R
a
t
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d
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n
p
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t
P
o
w
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r
:
2
5
V
A
T
0
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A
L25
0
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a
p
p
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1
1
5
V
-
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2
4
V-
+
2
4
V-
2
3
0
V
-
A
p
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d
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d
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2
3
0
V
-
2
1
+
-
G
N
D
3
1
2
+
-
G
N
D
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Di
r
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Di
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O
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2
Di
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D
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I
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Cas
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O
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1-
4
3
5
1-
4
3
5
LB
B
1
9
2
0
/
0
0
89
0
0
19
2000
0
5
1
15
/
23
0
V
~,
5
0
/
6
0H
z
No.
1
/
L
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2
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L
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3
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L
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4
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L
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E
M
G
O
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t
D
C
I
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D
C
O
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t
3
5
4
1
2
EQUALISER
0
R
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d
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p
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P
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w
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:
2
5
V
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0
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0
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1
1
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0
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A
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2
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0
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1
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-
G
N
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3
1
2
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-
G
N
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3
L
R
1-
4
3
5
1
-
4
3
5
1-
4
3
5
D
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1
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3
D
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4
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1
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1
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1
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