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User's manual<br />
System Amplifier K&F TOPAS<br />
Butterworth<br />
7th ord.<br />
Butterworth<br />
8th ord.<br />
Linkwitz-<br />
Riley<br />
8th ord.<br />
42 dB/<br />
oct.<br />
48 dB/<br />
oct.<br />
48 dB/<br />
oct.<br />
4 2.247 0.802 0.555 0.707<br />
1st<br />
order<br />
4 2.563 0.9 0.601 0.51<br />
4 1.307 1.307 0.541 0.541<br />
11.1.6 AP = All Pass Filter<br />
The all pass filter is a frequency-dependent phase shifter. In doing this, it does not cause any<br />
increase or attenuation of frequency levels.<br />
The Q-Factor of a 2nd order filter defines the slope of the phase jump.<br />
Phas e in [°]<br />
180<br />
135<br />
90<br />
45<br />
0<br />
-45<br />
1.Ordnung (0.707)<br />
Q = 0.2<br />
Q = 0.5<br />
Q = 0.707 2.Ordng.<br />
Q = 10<br />
FilterType = 'AP' (Allpass Filter)<br />
Freq = 1000Hz<br />
-90<br />
-135<br />
-180<br />
20 50 100 500 1000 5000 10000 20000<br />
Fre quency in [Hz]<br />
You can choose between a high pass filter 1st or 2nd order. The Q of a 1st order high pass<br />
filter is always fixed. At a 2nd order high pass filter Q is adjustable in steps of 0.001 from 0.2<br />
to 20.<br />
11.1.7 Notch = Notch Filter<br />
This filter reduces a selected frequency down to complete cut-off. Feedback and interfering<br />
frequencies are reduced.<br />
The Q-factor determines the slope of the filter.<br />
The Q-factor of notch filters is usually between 0.1 and 20.<br />
After changing the type of a filter the value of Q is set to the default value 4.318.<br />
KLING & FREITAG GMBH © 2012 Revision 3.0 Page 63 of 65
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