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Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers
10.3.6 Connecting 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.
table 10.4: Audio input socket details
Socket
Balanced
+
+ Signal
0
Ground
-
- Signal
Note
The wiring to the local audio inputs must be less
than 3m in length.
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.
2
2
figure 10. 1 3: Jumper location
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Unbalanced
Right
Ground
Left
1
1
Channel 2
Unbalanced input
Channel 2
Balanced input
figure 10. 1 4: Jumper setting
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.
en | 174
Channel 1
Unbalanced input
Channel 1
Balanced input
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