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Connecting The Line Input And Loopthrough - Bosch LBB 1930 Installation And Operating Manual

Plena booster amplifier
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Plena Booster Amplifier | Installation and Operating Manual |

4.2 Connecting the line input and loopthrough

Figure 4.3
The booster amplifier has a balanced line input for connection to a preamplifier or a mixer. Use the loopthrough
connection to connect the booster amplifier to another booster amplifier if more power is needed. Each power
amplifier must be connected to its own set of loudspeakers. Do not connect booster outputs to each other. The
LBB1930 and LBB1935 have both XLR (3 and 5) and phone jack connectors (4 and 6) for input and loopthrough.
For the LBB1938 use program line - input 2 (4) and line loopthrough 2 (6) for normal operation without priority.
Volume control
Use the volume control next to the line input to set the output level of the booster amplifier.
Bosch Security Systems | 2003-09 | 3922 988 92983en
LBB1925/10
Tel/E
MG
Trigg
er 1
Trigg
er 2
/Lin e
0
1.Au
dio+
2.0V
5.Al lcall
3.Au
6.Da
4.24
dio-
ta-
Vd.c
7.Da
ta+
/Lin e
.
8.Ch
s.GN
D
PCA
udio In
1-
3
RS2
32
CD
Zon e
4
3
5
5
5
1
L
Zon e
2
4
6
Aux
Call
Activ
App arat
+
e
Call
us deliv
2
-
GND
In
conn
ecte d
ered
7
6
R
1
GND
+
100V
In
for 230V
3
8
1
3
1
-
2
0
115V
-
- 230V
5
2
4
3
Zon e
100V
-
1
0
Ma ster
Zon e
2
Out
Zon e
100V
3
0
Out
Zon e
4
100V
100V
0
0
DC Out
100V
DC In
0
100V
0
100V
0
+24V
-
+24V
-
Rate
Warn
d input
ing
Powe
This
appa
r : 50VA
ratus
must
T1.0A
L 250V
be earth
ed
3
5
LBB1930
LBB1935
+
GND
100 V
1
-
2
GND
0V
3
1
2
+
3
-
100 V
230 V-
100 V
70V
240 V-
0
0
24V
8
DC IN
-
+
line out
Line
fuse
250 V
T1A
War ning
This
App arat
appa
ratus
con nec
us deli
must
ted for
be earth
ed
4
6
LBB1938
4 6
War ning
This
appa
ratus
mus t
be earth
ed
External settings and connections
3 5
+
GND
100 V
1
-
2
GND
0V
3
1
2
+
3
-
100 V
line out
vere d
230 V-
4
6
4 6
LBB1930
LBB1935
100 V
230 V-
70V
240 V-
0
0
24V
8
DC IN
-
+
Line
fuse
250 V
T1A
War ning
This
App arat
appa
ratus
con nec
us deli
must
ted for
vere d
be earth
230 V-
ed
LBB1938
War ning
This
appa
ratus
mus t
be earth
ed
en | 13

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This manual is also suitable for:

Lbb 1935Lbb 1938