Bosch PRAESENSA PRA-CSLD - Audio Processing; Amplifier

PRAESENSA Configure the system | en 97
Bosch Security Systems B.V. Configuration manual 2020-09 | V1.20 | PRAESENSA 1.20
5.8 Audio processing
On the Audio processing pages, the audio processing parameters of an audio input of a call
station and/or audio outputs of an amplifier in the PRAESENSA system can be set: See:
– Amplifier, page 97
– Call station, page 100
The DSP audio equalizers have an internal headroom of 18dB. Do not use audio equalizer
settings with an accumulated gain of more than 18dB at any frequency, as this will cause
audio clipping for full scale input signals. It is good practice to do most of the frequency
response corrections by attenuation of prominent frequency bands.
5.8.1 Amplifier
On the Audio processing page of the Amplifier, the audio processing parameters of the
selected amplifier outputs can be set.
– For each audio output of the amplifier, a parametric equalizer, an audio delay option and
a volume level selection button is available to set the audio output signal.
1. Below the Audio processing page, click Amplifier:
– A new screen appears listed the connected Amplifier(s).
2. Select and click the Amplifier name to configure.
– A new screen appears listed the Amplifier outputs.
3. Select and click the + of the Amplifier output category row:
– The audio processing / parametric equalizer overview appears.
4. Select each of the following items, if required.
F: Frequency, G: Gain, Q: Quality factor
Item Filter Value Description
High‑pass
filter
Enter F
Select Q
Default: Frequency 60Hz, Quality factor 0.7
(selectable 0.2 ‑ 2.0).
Fixed: Gain -12dB/oct.
Shelving
filter
(for low
frequencies)
Enter F
Select G
Default: Frequency 500Hz, Gain 0dB
(selectable: -infinite - +12dB).
Full
parametric
sections (3)
Enter F
Select Q,
G
Default: Frequency 1000Hz, Quality factor 20.0
(selectable 0.4 ‑ 20.0), Gains 0dB
(selectable: -infinite - +12dB)
Shelving
filter
(for high
frequencies)
Enter F
Select G
Default: Frequency 2000Hz, Gain 0dB
(selectable: -infinite - +12dB).