Controls And Indicators (Front) - Bosch LBB 1930 Installation And Operating Manual

Plena Booster Amplifier | Installation and Operating Manual |
The Plena Booster Amplifier range consists of three mono amplifiers with output powers of 120 W (LBB1930), 240
W (LBB1935) or 480 W (LBB1938). These booster amplifiers have 70 V and 100 V constant voltage outputs and a
low impedance output for 8 Ohm loudspeakers. The amplifiers are protected against overload and short circuits.
Built-in features like a temperature controlled fan and an overheat protection ensure high reliability. Battery
operation with automatic switchover from the mains supply is possible. The line inputs are balanced and have a
loopthrough facility; a 100 V slave input allows for connection to existing loudspeaker lines. The LBB1938 has
double inputs with a priority function and priority controlled outputs.

1. 1 Controls and indicators (front)

2
Plena Booster Amplifier
0 dB
1 VU meter (LED bar)
-6 dB
-20 dB
2 Power on indication LED (green)
Power
3 Power on/off
4 Tone control, channel 1 to 4
1
Figure 1.3
2
Plena Booster Amplifier
0 dB
-6 dB
-20 dB
Power
1
Figure 1.4
1 Power button
2 VU-meter (LED's for -20, -6, 0 dB and Power ON)
3 Battery operation indicator (only for LBB1938)
4 Overheat indicator (only for LBB1938)
5 Air inlet for forced air cooling (only for LBB1938)
Bosch Security Systems | 2003-09 | 3922 988 92983en
About the equipment
5 Volume, channel 1 to 4
6 Master volume
7 Channel selection for headphone
8 Headphone connection
en | 8
LBB1930
LBB1935
LBB1938
Battery Overheat
3 4 5