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Bosch Security Systems | 2003-06 | 3922 988 54284
CCS 800 Ultro | Installation and Operating Manual en | 15
6.10 Volume control of the delegate
and chairman units
Turn the volume control (1) to set the volume of the
loudspeakers of the delegate and chairman units (2).
Adjust for maximum level without feedback. In the fully
counterclockwise position all loudspeakers are muted.
6.11 Using Digital Acoustic
Feedback Suppression (DAFS)
Figure 6.11
Put the Digital Acoustic Feedback Suppression switch
(1) in position "0" and adjust the loudspeakers for
maximum level without feedback. Switch Digital
Acoustic Feedback Suppression on by changing the
switch (1) to position "1". Then set the loudspeaker
volume to the required level, but increasing the volume
level more than 2 or 3 steps is not recommended.
Figure 6.10
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CCS
800 ULTRO
GainGain
90-260 V~
Trunk in/out Recorder Line Telephone Insertion
Digital Acoustic
Feedback Suppression
Microphone
In
Out
1
Note
With the use of Digital Acoustic Feedback
Suppression the loudspeaker volume can be
increased significantly before acoustic feedback
appears. The maximum achievable volume gain
depends on the acoustical environment and
positioning of the units. Artefacts may occur
during microphone switching at very high
volume levels. In general the achievable
increased volume gain is 4 - 6 dB.
The Digital Acoustic Feedback Suppression is
optimised for speech.