KLING & FREITAG K&F CD 44 Digital System controller - Manual (Page 18)

User's manual K&F CD 44 Digital System Controller
KLING & FREITAG GMBH © 2014 Version 11.6 Page 18 of 77
Q = 0,707
The Q-factor determines the slope of the filter.
Normally, shelving filters are used with a Q-factor of up to 0.707.
With Q-factors higher than 0.707, the selected frequency is increased and an area above
this frequency range is attenuated correspondingly. The shelving filter is, thus, normally
only used up to Q 0.707.
A Q higher than 0.707 may result in unwanted sound changes.
Q is adjustable in 0.001 steps from 0.2 to 20.
As soon as a Seq10 LS-Block is loaded into the controller, the corresponding input channel
of the input filter 4 is set to SEQ LShelv. Furthermore, frequency, Q-factor and gain are
limited to sensible levels for this use. It is necessary to set an LShelv for all tops in order to
counteract the coupling of the arrayed low-mid speakers.
The LShelv is to be programmed IDENTICALLY for every input path of all tops.
SEQ LShelv setting for exemplary speaker arrays (default values):
In practice, depending on the geometry of the room and other application-specific
factors, the actual values to be set may vary from the default values listed below.
Therefore, the sound engineer may finely adjust the output gain using an additional
parametric filter when setting the system.
The filter depth and the cut-off frequency of the low shelving filter depend on the
amount of speakers. The larger the number of speakers
• the stronger the attenuation
• and the lower the cut-off frequency
The attenuation can be set from 0 to -14 dB, the cut-off frequency from 250 Hz – 1 kHz, Q
from 0.5 – 0.707.
The following chart shows reference values for selecting the SEQ LShelv for all SEQUENZA
10 tops in each corresponding array:
Number
of tops
GAIN Freq Q
1, - 6, -4.5 dB 1 kHz 0.7
7 - 8 -7 dB 850 Hz 0.7
9 - 10 -9 dB 850 Hz 0.7
11 - 12 -8.5 dB 500 Hz 0.7
13 - 16 -11 dB 300 Hz 0.7
17 - 18 -11 dB 250 Hz 0.7
19 - 20 -12 dB 350 Hz 0.5
21 - 22 -13 Hz 250 Hz 0.5
23 - 24 -14 dB 250 Hz 0.5
You can create the SEQ LShelv settings by the software CD Remote automatically. Please
specify the number of used tops. Refer the Software Starter Guide 'CD Remote'.
4. This example shows different high pass filters which are characterised by varying Q
factors.