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
Rated
input
Power
: 25VA
T0.5AL
250V
This ap
paratu
s mus
t be ear
thed
Warnin
g
115V-
+24V-
+24V-
230V-
Appara
tus deliv
ired
connec
ted for
230V-
2
1
+
-
GND
3
1
2
+
-
GND
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Dir.Out1
Dir.Out
2
Dir.Out3
Dir.Out4
Ins/Cas
c/Emgln
Ins/Ca
sc
Ins/Ca
scOut
Master
Line O
ut
Master
Mic. O
ut
1-
4
3
5
1-
4
3
5
LBB 19
20/00
8900 19
2 000
05
115/23
0V~,50
/60H
z
No.
1/Line
2/Line
3/Line
4/Line
EMG
Out
DC In
DC O
ut
3
5
4
1
2
EQUA
LISER
0
Rated
input
Power
: 25VA
T0.5AL
250V
This ap
paratus
must be
earthed
Warnin
g
115V-
+24V-
+24V-
230V-
Appara
tus deliv
ired
connec
ted for
230V-
2
1
+
-
GND
3
1
2
+
-
GND
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Dir.Out1
Dir.Out2
Dir.Out3
Dir.Out4
Ins/Cas
c/Emgl
n
Ins/Cas
c
Ins/Cas
cOut
Master
Line Ou
t
Master
Mic. Ou
t
1-
4
3
5
1-
4
3
5
LBB
1920/0
0
8900 1
92 00
005
115/23
0V~,50
/60Hz
No.
1/Line
2/Line
3/Line
4/Line
EMG
Out
DC In
DC Ou
t
3
5
4
1
2
0
Rated
input
Power
: 25VA
T0.5AL
250V
This app
aratus
must be
earthe
d
Warnin
g
115V-
+24V-
+24V-
230V-
Appara
tus deliv
ired
connec
ted for
230V-
2
1
+
-
GND
3
1
2
+
-
GND
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Dir.Out1
Dir.Out2
Dir.Out3
Dir.Out
4
Ins/Cas
c/Emgln
Ins/Cas
c
Ins/Ca
scOut
Master
Line O
ut
Master
Mic. O
ut
1-
4
3
5
1-
4
3
5
LBB 19
20/00
8900 1
92 000
05
115/23
0V~,50
/60Hz
No.
1/Line
2/Line
3/Line
4/Line
EMG
Out
DC In
DC
Out
3
5
4
1
2
0
Rated
input
Power
: 25VA
T0.5AL
250V
This ap
paratus
must be
earthed
Warnin
g
115V-
+24V-
+24V-
230V-
Appara
tus deliv
ired
connec
ted for
230V-
2
1
+
-
GND
3
1
2
+
-
GND
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Dir.Out1
Dir.Ou
t2
Dir.Ou
t3
Dir.Ou
t4
Ins/Cas
c/Emgln
Ins/Cas
c
Ins/Cas
cOut
Master
Line Ou
t
Master
Mic. O
ut
1-
4
3
5
1-
4
3
5
LBB 19
20/00
8900 1
92 00
005
115/23
0V~,5
0/60H
z
No.
1/Line
2/Line
3/Line
4/Line
EMG
Out
DC In
DC
Out
3
5
4
1
2
0
Rated
input
Power
: 25VA
T0.5AL
250V
This ap
paratus
must be
earthed
Warnin
g
115V-
+24V-
+24V-
230V-
Appara
tus deliv
ired
connec
ted for
230V-
2
1
+
-
GND
3
1
2
+
-
GND
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Dir.Out1
Dir.Out2
Dir.Out3
Dir.Out4
Ins/C
asc/Em
gln
Ins/Cas
c
Ins/Cas
cOut
Master
Line O
ut
Master
Mic. O
ut
1-
4
3
5
1-
4
3
5
LBB 19
20/00
8900 19
2 0000
5
115/23
0V~,50
/60Hz
No.
1/Line
2/Line
3/Line
4/Line
EMG
Out
DC In
DC
Out
3
5
4
1
2
0 dB
-6 dB
-20 dB
Power
/Line
Power
CD
AUX
Select
Z1
Z2
Z3
+
+
Z4
Z5
Z6
0 dB
-6 dB
-20 dB
Plena
Mixer Amplifi
er
Plena
System Pre
-amplifier
Summary of Contents for LBB 1920
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