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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 3 | Control Equipment en | 117
6.7.7 Audio microphone inputs (only
input 1 and input 2)
6.7.8 Audio outputs
Connector (rear side):
Female galvanically separated XLR per input
Preferred cable:
Shielded
Nominal input level:
-57 dBV based on 91 dBSPL for a microphone with
sensitivity of 2 mV/Pa, a male voice with normal
loudness and a speaker to microphone distance of
0.15 m
Headroom:
30 dB
Input range:
-7 to +8 dB with respect to nominal input level
(limiter threshold)
Input sensitivity setting:
Software
Frequency response:
-3 dB points at 300 Hz and 20 kHz (tolerance ± 1 dB)
First order, high-pass speech filter at 300 Hz
Input impedance:
136 0 ohm
Signal/Noise ratio
> 62 dBA with 25 dB headroom
Common mode rejection ratio:
> 55 dB at 100 Hz
> 65 dB at 1 kHz and 10 kHz
Phantom supply:
12 V ± 1 V (max. 15 mA)
Limiter:
Analog limiter, level -8 dB with respect to maximum
• attack time: 1 ms
• decay time: 300 ms
• threshold at nominal input level
(Only for audio expanders of version HW15/xx and
higher. Hardware information can be obtained using
the front panel menu.)
Connector (rear side):
One galvanically separated XLR and one stereo (dual
mono) cinch for each output
Preferred cable:
Shielded
Maximum output level:
+ 18 dBV ± 1 dB (XLR)
+ 6 dBV ± 1 dB (cinch)
Output range:
-30 dB to 0 dB with respect to maximal output level
Output level setting:
Software
Frequency response:
-3 dB points at 20 Hz and 20 kHz (tolerance ± 1 dB)
Output impedance:
< 100 ohm
Signal/Noise ratio:
> 89 dBA at maximum level
Output cross-talk:
< -85 dB
Distortion:
< 0.05% at 1 kHz at -3 dB of the maximum input
signal