Bosch LBB 1930 - Equipment Overview; Front Panel Controls and Indicators; LBB1930;LBB1935 Front View; LBB1938 Front View

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