Praesideo 3.5 Installation and User Instructions 4 Amplifiers

en 141

 

Spare In +

100 V

Lsp Out +

1

 

70 V

50 V

50 V

 

 

Spare In -

 

Lsp Out -

 

0 V

100 V

Spare In +

Lsp Out +

2

 

70 V

50 V

50 V

 

 

Spare In -

 

Lsp Out -

 

0 V

figure 8.9: Power amplifier, after spare switching

Often, for each rack of main amplifiers, one spare amplifier is used. To connect multiple main amplifiers of the same type to a spare amplifier of the same type:

•Connect the loudspeaker output of the spare amplifier to the spare inputs of the first main amplifier.

•Loop-through the spare inputs of the first main amplifier to the spare inputs of the other main amplifiers. Please note that if the number of failing main power amplifier increases, the loudspeaker load of the spare power amplifier increases. This can result in an overload of the power amplifier. Also note that the audio distributed to the loudspeaker lines of all failing power amplifiers depends on the configuration settings of the first failing power amplifier, since only the configuration settings of the first failing power amplifier are transferred to the spare power amplifier.

8.3.6Connecting audio inputs

The number of audio inputs depends on the type of power amplifier.

table 8.6: Number of audio inputs

Type

Audio inputs

PRS-1P500

2

PRS-2P250

2

PRS-4P125

2

LBB4428/00

4

The audio inputs are used to interface with analog audio sources. Each audio input is selectable between line and microphone.

It is possible to connect unbalanced signal as well as balanced signals. Unbalanced signals can be connected to the 0 (GND) and the + or - pins (see figure 8.10). The remaining, non-connected pin do not have to be connected to the 0 pin. A balanced signal should be connected between the + and - pins of the audio input. The 0 (GND) pin can be connected to the shielding of the signal cable. However, this is not required.

Audio In

12

0 0

figure 8.10: Audio input connectors

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Number of audio inputs, Type Audio inputs PRS-1P500 PRS-2P250 PRS-4P125 LBB4428/00
Page 140 Page 142

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