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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 138
8.3.5.2 Loudspeaker lines
Between the Lsp Out+ and Lsp Out- connections, the
loudspeakers must be connected. The voltage between
these connections (100 V, 70 V or 50 V) depends on the
position of the jumper on the output board (see figure
8.5).
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). If it is set to 50 V, it is
reduced to 34 dBV (difference: -6 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 8.5: Top view of the power amplifier output boards
100 V 70 V 50 V
PRS-1P500, PRS-2P250, PRS-4P125
Power Amplifier
LBB4428/00
Power Amplifier
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