Bosch LBB 1920, Installation And Operating Manual

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

Plena Universal Pre-amplifier

 | Installation and Operating Manual | 

en

 | 13

4.2 Connect a microphone or line-level source

Figure 4.2

All channels have 3 possible inputs, use one of these inputs to connect a microphone or a line-level source. The 
XLR and DIN input are balanced, the stereo Cinch input is unbalanced and converted to mono. If you use an input 
make sure that the internal switch settings are correct (refer to §2.2).

Note

If you want to use the priority feature, you must use a microphone or line-level source with a priority contact 

on pin 4 and 5 of the 5-pole DIN plug.

3

5

4

1

2

2

1

+

-

GND

3

1

2

+

-

GND

3

1-

4

3
5

1-

4

3
5

1-

4

3
5

Dir.Out1

Dir.Out2

Dir.Out3

Dir.Out4

Ins/C

asc/Emg

l

Ins/Ca

sc

1/Line

2/Line

0

Rated

input

Power

: 25VA

T0.5AL

250V

This ap

paratus

must b

e earthe

d

Warnin

g

115V-

+24V-

+24V-

230V-

Apparat

us deliv

ired

connec

ted for

230V-

2

1

+

-

GND

3

1

2

+

-

GND

3

L

R

1-

4

3
5

1-
4

3
5

1-

4

3
5

Dir.Out1

Dir.Out2

Dir.Out

3

Dir.Out4

Ins/Cas

c/Em

gln

Ins/Cas

c

Ins/Cas

cOut

Master

Line O

ut

Master

Mic. O

ut

1-

4

3
5

1-

4

3
5

LBB 19

20/00

8900 1

92 000

05

115/23

0V~,50

/60Hz

No.

1/Line

2/Line

3/Line

4/Line

EMG

Out

DC In

DC O

ut

3

5

4

1

2

Cinch

180 5-pole DIN

180 3-pole XLR

GND

GND

GND

External settings and connections