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User's manual<br />
System Amplifier K&F TOPAS<br />
This 'bell' is logarithmically symmetrical relative to the selected frequency (in the example:<br />
1000 Hz).<br />
The Q-factor defines the quality of the filter. In doing so, it determines the width of the<br />
frequency range which is to be increased or attenuated. The higher the Q-factor, the<br />
narrower the frequency range. A lower Q-factor thus has a wider range.<br />
"Q" is adjustable in steps of 0.001 from 0.2 to 20.<br />
Typical Q-values and their bandwidth equivalent:<br />
Bandwidth<br />
Q factor<br />
1/6 octave (whole step) 8.651<br />
1/3 Oktave (third) 4.318<br />
2/3 Oktave (two thirds) 2.145<br />
1 octave 1.414<br />
1 1/3 1.044<br />
1 2/3 0.819<br />
2 0.666<br />
11.1.2 HShelv = High Shelving Filter<br />
The 'high shelving filter' acts exactly as the 'low shelving filter'. The difference is, that at the<br />
'low shelving filter' the lower frequency band and at the 'high shelving filter' the higher<br />
frequency band can be adjusted. For further information, read chapter 'LShelv = Low Shelving<br />
filter'.<br />
11.1.3 LShelv = Low Shelving Filter<br />
These filters increase (positive gain) or attenuate (negative gain) the frequencies below or<br />
above the selected frequency.<br />
FilterType = 'LShelv' (Shelving Lowpass) Gain = +6dB Freq = 1000Hz<br />
+6<br />
Q = 0<br />
Q = 0.2<br />
Q = 0.5<br />
Q = 0.707 (default)<br />
Power in [dB]<br />
3<br />
0<br />
20 50 100 500 1000 5000 10000 20000<br />
Frequency in [Hz]<br />
The Q-factor determines the slope of the filter.<br />
KLING & FREITAG GMBH © 2012 Revision 3.0 Page 58 of 65
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