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Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers
10.3.5.2 Loudspeaker lines
Between the Lsp Out+ and Lsp Out- connections, the
loudspeakers must be connected. The voltage between
these connections (100 V, 70 V) depends on the
position of the jumper on the output board (see figure
10.7).
It is possible to use the different voltages to reduce the
volume of the loudspeaker line. For example, if all
loudspeakers are suitable for 100 V, the maximum
output level is 40 dBV. If the loudspeaker line voltage is
set to 70 V, the maximum output level is reduced to
37 dBV (difference: -3 dB).
PRS-1B500, PRS-2B250
R356
B
2
1
S350
X550
X400
PRS-4B125
PRS-8B060
8
figure 10.7: Top view of the basic amplifier output boards
Bosch Security Systems | 2011-02
R352
B
1
1
X6
X4
X155
2
+
100V
70V
100V
70V
X405
X404
X305
X304
X402
X403
X303
1
24
X5
X401
X301
R405
F400
F300
F750
X2
X651
X650
4
3
7
6
5
Caution
Check the specifications of the loudspeakers to
find out which maximum voltage can be
provided on the loudspeakers outputs of the
power amplifiers.
To reduce the risk of electric shock do not
perform any servicing other than that contained
in the operating instructions unless you are
qualified to do so. See section 1.2 Intended
audience.
X100
1
1
1
8
8
1
1
16
16
R190
9
9
1
X153
X3
X1
X101
F251
1
X300
X500
F250
F451
F450
1
X302
F50
R305
2
1
4
3
2
1
R140
100 V 70 V
70 V
100 V
100 V
70 V
en | 171
1
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