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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 174
10.3.6Connecting the local audio input
The basic amplifiers have a local audio input per
channel for a local signal source. This input has a low
priority and is controlled by the multi channel interface.
The local input signal is suppressed by any signal from
the Praesideo system to that channel (zone).
On the PRS-1B500 and PRS-2B250, the local audio
input can be set to balanced or stereo unbalanced. This
feature is not available on the PRS-4B125 and the
PRS-8B060. The input has line level sensitivity,
controlled with a sensitivity preset above the connector.
See figure 10.5 for details about the local audio input
socket and preset.
10.3.6.1 Balanced inputs
The jumper settings are set to balanced as default. See
table 10.4 for connections and figure 10.13 for the
jumper locations.
10.3.6.2 Stereo unbalanced input
On the PRS-1B500 and PRS-2B250, it is possible to
change the balanced input into an unbalanced mixing
stereo input for a e.g. CD player. Connect the right and
left channels according to table 10.4. Both channels are
added together into a mono signal. See figure 10.14 for
the jumper settings. Use a pair of tweezers to change the
jumper settings as the jumpers are difficult to reach.
10.3.6.3 Sensitivity control
Use the recessed sensitivity control to adjust the input
signal from a local audio device.
Use a small screw driver to adjust the potentiometer.
10.3.7 Connecting back-up power
Connect the back-up supply to the back-up power
connector on the back of the basic amplifier. Refer to
figure 10.15.
table 10.4: Audio input socket details
Socket Balanced Unbalanced
+ + Signal Right
0 Ground Ground
- - Signal Left
Note
The wiring to the local audio inputs must be less
than 3m in length.
figure 10.13: Jumper location
1
2
1
2
figure 10.14: Jumper setting
Channel 1
Unbalanced input
Channel 2
Balanced input
Channel 2
Unbalanced input
Channel 1
Balanced input