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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 171
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).
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.
figure 10.7: Top view of the basic amplifier output boards
+
+
+
+
+
+
+
+
+
+
A
2.5
1
1 1
1
375
mA
+
1
+
375
mA
375
mA
1
375
mA
375
mA
8
1
9
16
8
1
9
16
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
B
B
B
B
+
-
1
1
2
24
1
1
1
11
375
mA
X100
X103
R140
X101
X1
R190
X3
X151
X500
X155
X300
F251
F250
F451
F450
X153
X4
X6
R352
R356
X550
S350
X400
R405
X402
X651
100V70V
X303
X404X405
X403
100V
70V
X305 X304
X5
X401
6.3A
X301
F300F400
F750
X2
X650
R305
X302
F50
100 V 70 V
12
100 V
1
1
70 V
4 3 2 1
12345678
100 V
70 V
PRS-1B500, PRS-2B250
PRS-4B125
PRS-8B060