Bosch Plena LBB1930/20 - 100 V Slave Input Connection; Constant Voltage Loudspeaker Connection

100V slave input
The power amplifiers have a 100V slave input (18) that can be connected to an existing 100V
loudspeaker line. In this way it is easy to connect an additional power amplifier on a remote
location for more output power. The 100V input is not affected by the control terminals for
input 1 priority (20) or input 2 enable (19).
Priority Only No Priority
100V 0 100V 0
Priority Controlled Output
OOn
24V DC In
Apparatus delivered
connectored for 230V~
Main Power
BatteryInput
Fault Relays' Output
NO COM NC
OOn
NO COM NC NO COM NC
Input 1Pr iority
Loopthrough1
Input 2Pr ogram
Loopthrough2
Input 1Pr iority
2...24V- I nput 1
0V- Input 2
Input 2Ena ble
2..24V- Enable
0V- Mute
100V
0
Sla veI nput100V
+
+
-
-
100V
0
70V
0
8ohm
100V/70V
Sele ction(12A)
Prior ityOnly
0
0
No Priority
Prior ity
F701
F702
Battery
Power
Detection
Pilot-tone
Detector
230V~ 240V~
Design & Quality
The Netherlands
LBB 1938/10
NL-4827HG-10
Plena 480W Power Amplier
Max. output power 720W
Rated output power 180W
230V~,50/60Hz
S/N.
8900 193 81001
A035413
Made in China
N663
Rated input
Power : 1600VA
Input 1
P r io rity
S la ve Input
100 V
Input 2
E na ble
100V 0
100 V 70V0 0 8
Direct O utput
InputInput
Input 2-P rogra mInput 1-P r iority
2. . 24 V
Defa ul t O 
G ND 2. . 24 V
Defa ul t O n
G ND
100V 0
2.. 24 V
Defa ul t O 
G ND 2. . 24 V
Defa ul t O n
G ND
Figure 6.3: 100 V slave input
Notice!
If the 100V slave input is used, and the 0V and 100V are incorrectly connected, no pilot tone
is detected on the power amplifier. Refer to section Input pilot tone, page 16, for more
information.
Constant voltage loudspeakers
The power amplifier can drive 100V constant voltage loudspeakers at full power (100V) or half
power (70V). Connect the loudspeakers in parallel and check the loudspeaker polarity for in-
phase connection. The summed loudspeaker power should not exceed the rated amplifier
power.
6.3
6.4
Plena Power Amplifiers External connections | en 13
Bosch Security Systems B.V. Installation and Operation manual 2014.01 | V1.1 | LBB193x/x0