Praesideo 3.5 Installation and User Instructions 4 Amplifiers

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11Single loudspeaker line supervision

11.1Introduction

Single loudspeaker line supervision is only available for the PRS-xPxxx power amplifiers and not for the basic amplifiers.

The LBB4442/00 Line Supervision Set contains a supervision-master PCB and a supervision-slave PCB. With this set, it is possible to supervise the end of a loudspeaker line.

Note

Use multiple loudspeaker line supervision (see chapter 12) to supervise the ends of branches in loudspeaker lines and the loudspeakers themselves.

The supervision-master PCB must be installed on the output board of the amplifier channel that must be supervised, whereas the supervision-slave must be connected to the last loudspeaker in the loudspeaker line that must be supervised.

So, for each loudspeaker line, one set is needed. The supervision-slave is powered from the 20 kHz pilot tone of the power amplifier and communicates inaudibly with the supervision-master via the loudspeaker lines. No additional wiring is required. Faults in the loudspeaker lines are reported within 100 s. Communication is not affected by the audio signals on the loudspeaker lines.

The use of multi-wire cables is not recommended in combination with line supervision because crosstalk between audio channels may influence the line supervision.

Note

For the line supervision set to work correctly it is necessary to set the amplifiers to 70 V or 100 V output. The 50 V setting is not allowed.

Because certification for the EN54-16 standard has only been performed on the 100 V output of the Praesideo amplifiers, the installer shall only use the 100 V outputs of Praesideo for emergency sound systems in Europe.

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Single loudspeaker line supervision, Introduction
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