Datasheet - Kling & Freitag

User's manual
System Amplifier K&F TOPAS
11.1.4 HighP = High Pass Filter
This example shows different high pass filters which are characterised by varying Q factors.
2
0
-3
-6
FilterType = 'HighP' (Highpass)
Freq = 1000Hz
Power in [dB]
-12
-24
Q = 0.707 Butterworth 1.Ordnung
Q = 0.2
-36
Q = 0.5 Linkwitz-Riley 2.Ordnung
Q = 0.707 (default) Butterworth 2.Ordnung
-40
20 50 100 500 1000 5000 10000 20000
Frequency in [Hz]
The resulting filter Q = 0.707 is a 2nd order Butterworth filter and causes attenuation of
3 dB at the cut-off frequency (-3dB @ 1000Hz). Below the cut-off frequency, there is an
attenuation of 12 dB per octave (-12dB/octave).
A Q higher than 1 causes a level increase at the crossover frequency.
20
FilterType = 'HighP' (Highpass)
Freq = 1000Hz
10
Power in [dB]
0
-3
-12
Q = 0.707 (default) Butterworth 2.Ordnung
Q = 10
-24
20 50 100 500 1000 5000 10000 20000
Frequency in [Hz]
You can choose between a high pass filter 1st or 2nd order. The Q of a 1st order high pass
filter is always fixed. At a 2nd order high pass filter Q is adjustable in steps of 0.001 from 0.2
to 20.
The parameter 'Gain' has no effect with the high pass filters.
11.1.5 LowP = Low Pass Filter
This example shows various low pass filters at 1000Hz, which are characterised by different
Q-factors. The resulting filter with Q = 0.707 is a 2nd order Butterworth filter and causes an
attenuation of 3dB at the cut-off frequency (-3dB@1000Hz). Above the cut-off frequency,
there is an attenuation of 12dB per octave (-12dB/octave).
2
0
-3
-6
FilterType = 'LowP' (Lowpass)
Freq = 1000Hz
Power in [dB]
-12
-24
Q = 0.707 Butterworth 1.Ordnung
Q = 0.2
-36
Q = 0.5 Linkwitz-Riley 2.Ordnung
Q = 0.707 (default) Butterworth 2.Ordnung
-40
20 50 100 500 1000 5000 10000 20000
Frequency in [Hz]
A Q higher than 1 causes a level increase at the crossover frequency.
KLING & FREITAG GMBH © 2012 Revision 3.0 Page 61 of 65