KLING & FREITAG K&F TOPAS - Manual (Page 58)

User's manual System Amplifier K&F TOPAS
KLING & FREITAG GMBH © 2014 Version 3.1 Page 58 of 65
This 'bell' is logarithmically symmetrical relative to the selected frequency (in the example:
1000 Hz).
The Q-factor defines the quality of the filter. In doing so, it determines the width of the
frequency range which is to be increased or attenuated. The higher the Q-factor, the
narrower the frequency range. A lower Q-factor thus has a wider range.
"Q" is adjustable in steps of 0.001 from 0.2 to 20.
Typical Q-values and their bandwidth equivalent:
Bandwidth Q factor
1/6 octave (whole step) 8.651
1/3 Oktave (third) 4.318
2/3 Oktave (two thirds) 2.145
1 octave 1.414
1 1/3 1.044
1 2/3 0.819
2 0.666
11.1.2 HShelv = High Shelving Filter
The 'high shelving filter' acts exactly as the 'low shelving filter'. The difference is, that at the
'low shelving filter' the lower frequency band and at the 'high shelving filter' the higher
frequency band can be adjusted. For further information, read chapter 'LShelv = Low Shelving
filter'.
11.1.3 LShelv = Low Shelving Filter
These filters increase (positive gain) or attenuate (negative gain) the frequencies below or
above the selected frequency.
20 50 100 500 1000 5000 10000 20000
0
3
+6
Frequency in [Hz]
P
o
w
e
r
in
[
d
B
]
FilterType = 'LShelv' (Shelving Lowpass) Gain = +6dB Freq = 1000Hz
Q = 0
Q = 0.2
Q = 0.5
Q = 0.707 (default)
The Q-factor determines the slope of the filter.