Bosch LBB 1930 User Manual

Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | en | 14
4.3 Connecting the priority input and using the control terminals (LBB1938
only)
Figure 4.4
Next to the program input (Input 2-Program) the booster amplifier LBB1938 is also provided with a balanced
priority input (Input 1-Priority) for connection to another preamplifier or mixer.
Apply a control voltage of 2...24 V to the input 1 priority control terminals (15) to switch ON the priority input (1)
and mute the program input (4). In this way a local music source can be connected to the program input and a remote
emergency system to the priority input. The emergency source must be able to supply the 2…24 V control voltage to
override the local music source. The program input can be remotely controlled by using a switch that is connected
to the input 2 enable control terminals (14).
Application example for use of the LBB1938 control terminals (see fig. 4.4)
You can use up to six LBB1938 boosters in combination with the Plena LBB1925/10 System Pre-amplifier to build
a powerful multi-zone sound system. Zone switching of background music and calls is done via the LBB1925/10
zone relays in combination with the LBB1938 control terminals. The LBB1925/10 controls the background music
by distributing 24 Vdc via the music zone relays to the LBB1938 input 2 enable control terminals (14). The
LBB1925/10 controls the calls by distributing 24 Vdc via the call zone relays to the LBB1938 input 1 priority
control terminals (15). Each booster serves one loudspeaker zone. Each zone can be OFF, or receive music or a call.
External settings and connections
3
Te l/ E M G
0
L
R
1-
45
/Line
/Line
Trigger 1 Trigger 2
PCAudoln
1. Au di o+
2.0V
3.Audio-
4.24Vd.c.
5. Allcall
6.Data-
7. Da t a +
8.Chs.GND
RS232
CD Aux
MasterOut Out
100 V 0100V 0 100V 0 100V 0
100 V
115V 230V
Rated Input
Power : 50VA
T0.5L 250V
Apparatus delivered
connected for 230V-
0 100V 0 100V 0 100V 0
+24V- +24V-
This apparatus must be earthed
Warning
3
7
8
6
1
5
2
4
3 1
5
2
4
LBB1925/10
890019251005
115/230V~,50/60Hz
No.
3
1
+
-
2
GND
3
2
+
-
1
GND
Input 1
Priority
Slave Inp u t
100V
Input 2
Enable
Priority Only No Prior ity
100V 70V008
100V 100V00
Direct Output
InputInput
Input 2-ProgramInput 1-Priority
100V
0
70V
0
8ohm
100V/70V
PriorityOnly
0
0
No Priority
Priority
Input1 Priority
Loopthrough 1
Input2 Program
Loopthrough 2
Input1 Priority
2..24V-Input 1
0V-Input 2
Input 2 Enable
2..24V-Enable
0V-Mute
100V
0
Slave Input 100V
+
-
+
-
Priority ControlledOutput
LBB1938 LBB1938
LBB1925/10
Input 1
Priority
Slave Inp u t
100V
Input 2
Enable
Priority Only No Prior ity
100V 70V008
100V 100V00
Direct Output
InputInput
Input 2-ProgramInput 1-Priority
100V
0
70V
0
8ohm
100V/70V
PriorityOnly
0
0
No Priority
Priority
Input1 Priority
Loopthrough 1
Input2 Program
Loopthrough 2
Input1 Priority
2..24V-Input 1
0V-Input 2
100V
0
Slave Input100V
+
-
Priority ControlledOutput
100V 0
2...24V
Default Off
GND 2...24V
Default On
GND
100V 0
2...24V
Default Off
GND 2...24V
Default On
GND
Input2Enable
2..24V-Enable
0V-Mute
+
-
1 4
15
14
15
14
Zone 1 output Zone 2 output
to next zones
1 4

Bosch LBB 1930 Specifications

General

Brand	Bosch
Model	LBB 1930
Category	Amplifier
Language	English