Bosch LBB 1920, Installation And Operating Manual

Bosch Security Systems | 2003-09 | 3922 988 99482en

Plena Universal Pre-amplifier

 | Installation and Operating Manual | 

en

 | 8

1.1 Controls and connections (front)

Figure 1.2

1.2 Controls and connections (rear)

Figure 1.3

0 dB

-6 dB

-20 dB

Power

1/Line

2/Line

3/Line

4/Line

Master

0

Master

Select

1

2

3

4

5

1
2

3

4

5

5

5

6

7

8

4

4

4

Plena

Universal Pre-amplifier

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

3

1-
4

5

3

1/Line

2/Line

3/Line

1-
4

5

115V

230V

Apparatus delivired
connected for 230V-

This apparatus must be earthed

Warning

3

1

+

-

2

GND

3

2

+

-

1

GND

Dir.Out1

Dir.Out2

Dir.Out3

Dir.Out4

Ins/ Casc / Emgln

Ins/ Casc Out

Master Line Out

Master Mic. Out

Rated input
power: 25VA
T0,5AL250V

4/Line

3

1-
4

Ins/Casc

5

EMG Out

3

1-
4

5

3

1-

L

R

+24V-

+24V-

4

5

LBB 1920/00
8900 192 00005
115/230V~,50/60Hz
No.

DC In

DC Out

3

1

5

2

4

9

2

3

1

2

3

3

1

2

3

4

5

7

6

8

2

1

1

9

9

9

10

11

12

13

14

15

16

17

1 DIN (priority) input, channel 1 to 4 
2 XLR input, channel 1 to 4
3 Cinch input, channel 1 to 4
4 Tape output (Cinch)
5 Earth connection screw
6 Emergency relay output (terminal
7 24 V DC backup power input (terminal
8 24 V DC output (terminal)
9 XLR for direct output, channel 1 to 4

10 Insertion/ cascade switch
11 Insertion/ cascade / emergency input
12 Insertion/ cascade output
13 Master Line output (XLR)
14 Master Mic output (DIN, priority)
15 Mains voltage 115/ 230 V switch
16 Mains socket
17 Mains fuse