Connecting Loudspeakers; Constant Voltage Loudspeakers - Bosch LBB 1903/10 Installation And Operating Manual

Plena Mixer Amplifier | Installation and Operating Manual |

4.8 Connecting loudspeakers

100V
70V
100V
8 O hm
0
LBB1903/10
LBB1906/10
LBB1912/10
JP901
100V
100V
70V
70V
8 O hm
0
LBB1914/10
Figure 4.8

4.8.1 Constant voltage loudspeakers

The mixer amplifier can drive 100 V constant voltage loudspeakers at full power (100 V) or half power (70 V).
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. Ensure that the jumper(s) for loudspeaker voltage
selection is / are properly set (see §2.4).
You can use the Call Only output for 3-wire remote volume control override. In this case, ensure that the selected
voltage for the Call Only output is the same as for the direct output or the zone outputs.
Bosch Security Systems | 2003-09 | 3922 988 92883en
100V
0
70V
70V
0
JP802
8 O hm
0
Call Only
0
0
0
Mix O nly
0
+
24V
24V
-
Call Active
Call Only
0
0 0
0
Zone 1
Call/Mix
0 0
Z1 Front
JP902
100/70
8 O hm
Call/Mix
0 0
0
Zone 2
Call/Mix
0 0
Z2 Front
0
Mix O nly
0 0
+
24V
Call Active
24V
-
External settings and connections
Tel/E
mer . L
0
R
0 2
CD Out
Chim e Aux
1- -3 Line Out 1V In
4 .5
Mic/ Line Inc
Mic/ Line
1
2
3
4
Call/Mix Call Only Mix Only 24VDCIn
100V 0 70V 0 8 0 100/70V 0 100/70V 0
Call/Mix Call/Mix Call Only Mix Only
direct out direct out 100/70V 100/70V
100V 70V
Figure 4.9
Tel/E
mer . L
0
R
0 2
CD Out
Chim
e Aux
1- -3
Line Out 1V In
4 .5
Mic/ Line Inc
Mic/ Line
1
2
3
4
Call/Mix Zone 1 Zone 2 Call Only Mix Only 24VDCIn
100/70V/8 0 100/70V 0 100/70V 0 100/70V 0 100/70V 0
Call/Mix Zone 1 Zone 2 Call Only
direct out 100/70V 100/70V 100/70V
100/70V
Figure 4.10
en | 17
LBB1903/10
LBB1906/10
LBB1912/10
115 V/23
0V
Warn ing
This
appa ratus
must be earth
ed
24VDCIn
Call/Mix Call Only Mix Only
100V 0 70V 0 8 0 100/70V 0 100/70V 0
8 Ohm
4 Ohm
4 Ohm
8 Ohm 8 Ohm
8 Ohm
8 Ohm
Call/Mix direct out 8 Ohm
LBB1914/10
115 V/23
0V
Warn
ing
This appa
ratus
must be earth
ed
Call/Mix Zone 1 Zone 2 Call Only Mix Only 24VDCIn
100/70V/8 0 100/70V 0 100/70V 0 100/70V 0 100/70V 0
8 Ohm
4 Ohm
4 Ohm
8 Ohm 8 Ohm
8 Ohm
8 Ohm
Mix Only
100/70V
Call/Mix direct out 8 Ohm