Praesideo 3.5 Installation and User Instructions 4 Amplifiers

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10 Basic Amplifiers

The basic amplifier is completely supervised and fault events are reported via the multi channel interface to the Praesideo network controller.

10.1 Introduction

The basic amplifier is available in these versions:

•PRS-1B500: 1 channel, 500 W.

•PRS-2B250: 2 channels, 2 x 250 W.

•PRS-4B125: 4 channels, 4 x 125 W.

•PRS-8B060: 8 channels, 8 x 60 W.

The basic amplifier is a high efficiency class-D power amplifier for public address and emergency sound systems and is designed as an extension to the Praesideo system but can also work as a stand alone amplifier. If not used as a stand alone amplifier, the basic amplifier is used in conjunction with the multi channel interface which provides the audio signals and control.

Loudspeaker lines and loudspeakers connected to a basic amplifier channel can be supervised by using the LBB4441 and LBB4443 supervision boards. The multi channel interface acts as a supervision controller, so no LBB4440 is required.

In contrast to the power amplifiers, the basic amplifiers do no offer built-in audio processing functions as equalization, delay and automatic volume control.

Audio input

LED Indicators

Loudspeaker Out A

Priority Switching

Class D

Loudspeaker Out B

Multi Channel Interface

Audio input

+ Supervision (2)

(2)

Spare In

Loudspeaker Out A

Multi Channel Interface

Priority Switching

Class D

+ Supervision (1)

(1)

Loudspeaker Out B

Spare In

Mains

Power Supply

48 V Back-up

figure 10.1: Block diagram of a basic power amplifier

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Basic Amplifiers, Block diagram of a basic power amplifier
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