Bosch DCN Next Generation Installation & User's Instructions page 99

DCN Next Generation | Installation and User Instructions | Central Devices
11.4.3 Audio inputs
You can connect external analog audio sources to the
audio inputs of the audio expander. The audio expander
has four audio inputs. Each audio input has (refer to
figure 11.5):
• 1 XLR socket for balanced signals. The electric
circuits behind the XLR sockets contain
transformers.
• 1 double cinch socket for unbalanced signals.
Note
The audio inputs change stereo signals in mono
signals.
2
Audio In
3
figure 11.5: Audio input, connection
table 11.4: Audio input, connection
Pin Type
1 XLR
2
3
4 Cinch
5
Note
When the interlock is None (refer to section
33.6.6. 1 1), the audio inputs of the audio
expander are disabled for translation channels
only. Audio input channels can route to floor
channels.
Bosch Security Systems | 2007-02 | 9922 141 70525
1
5
4
Signal Description
Xternal Shield/ground
Live Positive
Return Negative
Live Signal in
Return Shield/ground
You can connect line level sources to all audio inputs of
the audio expander.
table 11.5: Audio inputs, line level signals
Number of connections:
• 1x XLR socket for each audio input
• 1x double cinch socket for each audio input
Location:
Rear side
Cable:
Shielded cable
Maximum level:
Refer to appendix A
Nominal level:
Refer to appendix A
Frequency response:
-3 dB @ 30 Hz and 20 kHz
Impedance:
• XLR: 22 kΩ
• Cinch: 12 kΩ
Signal-to-noise ratio:
> 87 dBA @ max. output level
CMRR:
> 60 dB @ 100 Hz
Crosstalk attenuation:
> -85 dB @ max. level
Distortion:
< 0. 1 % @ 100 Hz @ -3 dB of the max. level
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