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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 133
8 Power Amplifiers
8.1 Introduction
The PRS-1P500, PRS-2P250 and PRS-4P125 power
amplifiers are the successors of the LBB4421/10,
LBB4422/10 and LBB4424/10 power amplifiers. The
main difference is that the efficiency of the new
amplifiers is higher, so their power consumption is less
for the same output power. This is especially noticeable
in Idle mode and in Stand-by or Power save mode,
saving valuable battery power in situations where this is
allowed (not for EN54-16 compliant installations).
The main function of the Power Amplifiers is the
amplification of audio signals for the loudspeakers. The
amplifiers are high-efficiency class D amplifiers with
switched mode power supply. The amplifiers are
protected against overload, overheat and short-circuits.
See figure 8.1 for a block diagram of the power
amplifier.
The power amplifiers have configurable audio
processing functions, like parametric equalization, audio
delay and the possibility for noise dependent automatic
volume control (AVC).
Note
The number of inputs, spare amplifier
connections, loudspeaker lines and control
outputs depends on the type of power amplifier.
figure 8.1: Block diagram of a power amplifier
A/D
D/A
(1..8)
Class D
(1..8)
Network
Processor
+
DSP
Display + Control
Power Supply
Loudspeaker Out
Audio Inputs
Control Inputs
POF
POF
Mains
Control Outputs (1..8)
Network
Redundancy
Switching
IO
48 V Back-up
Spare Amplifier