KLING & FREITAG K&F TOPAS - Manual (Page 59)

User's manual System Amplifier K&F TOPAS
KLING & FREITAG GMBH © 2014 Version 3.1 Page 59 of 65
20 50 100 500 1000 5000 10000 20000
-12
-10
0
+3
15
14
Frequency in [Hz]
P
o
w
e
r
in
[
d
B
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FilterType = 'LShelv' (Shelving Lowpass) Gain = +3dB Freq = 1000Hz
Q = 0.707 (default)
Q = 10
Below = LShelv,
Above = HShelv.
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.
SEQ LShelv: (coming soon) As soon as a SEQ10 LS block is loaded into the amplifier, 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):
Depending on the spatial geometry and other application-specific factors, the values that
must actually be set in practice may vary from the below-mentioned recommended values.
This is why the sound engineer should always fine tune the output gains when setting up 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.
LShelv, SEQUENZA 5:
The following chart shows reference values for selecting the SEQ LShelv for all SEQUENZA 5
tops in each corresponding array:
Number of tops Gain Freq Q
1 - 3 0 dB 570 Hz 0.7
4 - 5 -5.0 dB 570 Hz 0.7
6 -7.0 dB 570 Hz 0.7
7 -8.0 dB 570 Hz 0.7
8 -9.0 dB 570 Hz 0.7