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Insertion Or Cascade Connection; Connect A Booster Amplifier Or System Pre-Amplifier - Bosch LBB 1920 Installation And Operating Manual

Plena universal pre-amplifier
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Plena Universal Pre-amplifier | Installation and Operating Manual |

4.3 Insertion or Cascade connection

Di r.O
ut 1
Di r.O
ut 2
Di r.O
ut 3
Di r.O
ut 4
1-
3
4
3
Ins /C
5
1
as c/E
5
mg ln
4
2
1-
+
Ins /C
3
GND
as c
4
2
-
5
1
3
GND
+
1
-
2
3
1-
3
1/ Li ne
4
5
2/ Li ne
3/ Li ne
Figure 4.3
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.
Bosch Security Systems | 2003-09 | 3922 988 99482en
Ins /C
as cO
ut
Ma ste
r Lin
e Ou
t
Ma ste
r Mi c.
Ou t
11 5V
-
23 0V
-
1-
3
4
1-
Ap pa
5
3
rat us
4
co nn
de livi
ec ted
red
5
Wa rni
for 23
0V -
ng
Ra ted
Thi s
inp ut
app ara
Pow er
tus mu
T0. 5A
: 25V
st be
L 250
A
ear the
d
V
0
L
EM G
4/ Li ne
Ou t
DC In
R
DC Ou
t
+2 4V
-
+2 4V
-
E Q U
A L I S
E R
Dir .Ou
t1
Dir .Ou
t2
Dir .Ou
t3
Dir .Ou
t4
1-
3
4
3
Ins/ Cas
5
1
5
c/E mg
2
4
ln
Ins/ Cas
cOu t
1-
3
+
Ins/ Cas
Ma ster
4
GND
c
Line
5
2
-
1
Out
3
Ma ster
GND
+
1
-
Mic .
Out
2
3
1-
3
1/L ine
4
5
115 V-
230 V-
1-
3
2/L ine
4
1-
App ara
5
3
con nec
tus del
4
ted for
ivire d
5
War ning
230 V-
Rate
This
d inpu
app arat
Pow er
t
us mus
T0.5
: 25V
A
t be
eart hed
AL 250
3/L ine
V
0
L
EM G
4/L ine
Out
R
DC In
DC Out
+24 V-
+24 V-
0 dB
-6 dB
-20 dB
Po we
r
External settings and connections
Di r.O
ut 1
Di r.O
ut 2
Di r.O
ut 3
Di r.O
ut 4
1-
3
4
3
Ins /Ca
5
1
5
2
4
1-
+
3
Ins /Ca
4
GND
sc
2
-
5
1
3
GND
+
1
-
2
3
1-
3
1/ Lin
4
e
5
2/ Lin
e
Di r.O
ut 1
Di r.O
ut 2
Di r.O
ut 3
Di r.O
ut 4
1-
3
4
3
Ins /Ca
1
5
5
4
2
1-
+
Ins /Ca
3
GND
4
2
-
sc
5
1
3
GND
+
1
-
2
3
1-
3
1/ Lin
4
5
e
2/ Lin
e
Figure 4.4
Dir .Ou
t1
Dir .Ou
t2
Dir .Ou
t3
Dir .Ou
t4
1-
3
4
3
Ins/ Cas
5
1
5
c/E mg
2
4
ln
Ins/ Cas
cOu t
1-
3
+
Ins/ Cas
Ma ster
4
GND
c
Line
5
2
-
1
Out
3
Ma ster
GND
+
1
-
Mic .
Out
2
3
1-
3
1/L ine
4
5
115 V-
1-
3
2/L ine
4
1-
App ara
5
3
con nec
tus del
4
ted for
5
War ning
Rate
This
d inpu
app arat
Pow er
t
us mus
T0.5
: 25V
A
t be
eart hed
AL 250
3/L ine
V
0
L
EM G
4/L ine
Out
R
DC In
+24 V-
+24 V-
0 dB
-6 dB
-20 dB
Po we
r
Se lec
/Li ne
t
CD
AUX
Z1
Z2
+
Z3
Z4
Z5
+
Z6
sc/ Em
gln
Ins /Ca
scO ut
Ma ste
r Lin
e Ou
t
Ma ste
r Mi c.
Ou t
11 5V
-
23 0V
-
1-
3
4
1-
Ap pa
5
rat us
3
co nn
de livi
4
ec ted
5
for 23
red
Wa rnin
g
Ra ted
0V -
Thi s
inp ut
app ara
Pow er
tus mu
T0. 5AL
: 25V
st be
A
ear the
250 V
d
3/ Lin
e
0
L
EM G
4/ Lin
Ou t
e
R
DC In
DC Ou
t
+2 4V
-
+2 4V
-
sc/ Em
gln
Ins /Ca
scO ut
Ma ste
r Lin
e Ou
t
Ma ste
r Mi c.
Ou t
11 5V
-
23 0V
-
1-
3
4
1-
Ap pa
5
3
rat us
4
co nn
de livi
ec ted
red
5
Wa rnin
for 23
0V -
g
Ra ted
Thi s
app ara
Pow er
inp ut
tus mu
T0. 5AL
: 25V
A
st be
250 V
ear the
3/ Lin
d
e
0
L
EM G
4/ Lin
Ou t
e
DC In
R
DC Ou
t
+2 4V
-
+2 4V
-
230 V-
ivire d
230 V-
DC Out
en | 14

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