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Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers
8.3.5 Connecting the amplifier channels
8.3.5. 1 Introduction
An amplifier channel (see figure 8.4) is a group of
outgoing signals that have been processed by the same
amplifier unit of the power amplifier. The number of
amplifier channels depends on the type of power
amplifier (see table 8.3).
table 8.3: Number of amplifier channels
Type
PRS-1P500
PRS-2P250
PRS-4P125
LBB4428/00
Control Out
C
NO NC
figure 8.4: Amplifier channel connector
table 8.4: Amplifier channel connector details
Pin
Description
1, 2, 3
Control outputs contacts. See
section 8.3.5.4.
4, 8
Spare amplifier. See section 8.3.5.5.
5, 9
Loudspeaker line. See section
8.3.5.2.
6, 7
Fixed 50 V line. See section 8.3.5.3.
Bosch Security Systems | 2011-02
Amplifier channels
1
2
4
8
Spare In
Lsp Out
0V
50V
Caution
To prevent the hazard of electric shocks, switch
off the power amplifiers and disconnect the
back up power supplies from the power
amplifiers before connecting loudspeaker lines
and spare amplifier connections.
Caution
After connecting wires to the amplifier channel
connectors, install the plastic safety bracket.
The plastic safety bracket makes sure that the
amplifier channel connectors cannot be
touched.
9
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