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Bosch Security Systems | 2003-09 | 3922 988 92883en
Plena Mixer Amplifier | Installation and Operating Manual | en | 17
4.8 Connecting loudspeakers
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.
0
0
0
8Ohm
8Ohm
70V
100V
100V
70V
JP802
100V
0
70V
0
0
+
-
24V
24V
CallOnly
0
MixO nly
0
CallActive
8Ohm
8Ohm
70V
70V
100V
100V
JP901
0
0
+
-
24V
24V
CallOnly
Zone 2
Zone 1
Call/Mix
Call/Mix
Call/Mix
Call Active
MixO nly
Z1Front
Z2Front
LBB1914/10
LBB1903/10
LBB1906/10
LBB1912/10
JP902
100/70
0
0
0
0
0
0
0
0
0
0
0
0
0
External settings and connections
1
1
5
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2
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0
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70
V
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1
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0
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0
V
0
8
0
Call/Mix
directout
100V
Call/Mix
directout
70V
CallOnly
100/70V
MixOnly
100/70V
8Ohm
Call/Mixdirectout8Ohm
Call/Mix
24VDCIn
CallOnly MixOnly
100V
0
70V
0
100/70V
0
100/70V
0
08
100V
0
70V
0
100/70V
0
100/70V
0
08
Call/Mix
24VDCIn
CallOnly MixOnly
4Ohm
4Ohm
8Ohm
8Ohm
8Ohm
8Ohm
LBB1903/10
LBB1906/10
LBB1912/10
1
1
5
V
/
2
3
0
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A
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2
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1
3
4
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.
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2
C
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4
.
5
1
--
3
Call/Mix
directout
100/70V
Zone1
100/70V
Zone2
100/70V
CallOnly
100/70V
8Ohm
MixOnly
100/70V
Call/Mixdirectout8Ohm
4Ohm
4Ohm
8Ohm
8Ohm
8Ohm
8Ohm
24VDCIn
Call/Mix
Zone1 Zone2
CallOnly MixOnly
100/70V/8 0100/70V0100/70V0100/70V0100/70V0
24VDCIn
Call/Mix
Zone1 Zone2
CallOnly MixOnly
100/70V/8 0100/70V0100/70V0100/70V0100/70V0
LBB1914/10
C
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ix
2
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D
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Mi
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1
0
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V
0
7
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V
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1
0
0
/
7
0
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01
0
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7
0
V
0
8
0
Figure 4.9
Figure 4.10