KLING & FREITAG K&F TOPAS - Manual (Page 63)

User's manual System Amplifier K&F TOPAS
KLING & FREITAG GMBH © 2014 Version 3.1 Page 63 of 65
Butterworth
7th ord. 42 dB/
oct.
4 2.247 0.802 0.555 0.707
1st
order
Butterworth
8th ord. 48 dB/
oct.
4 2.563 0.9 0.601 0.51
Linkwitz-
Riley
8th ord. 48 dB/
oct.
4 1.307 1.307 0.541 0.541
11.1.6 AP = All Pass Filter
The all pass filter is a frequency-dependent phase shifter. In doing this, it does not cause any
increase or attenuation of frequency levels.
The Q-Factor of a 2nd order filter defines the slope of the phase jump.
20 50 100 500 1000 5000 10000 20000
-180
-135
-90
-45
0
45
90
135
180
Fre que ncy in [Hz]
P
h
a
s
e
in
[°
]
Filte rType = 'AP ' (Allpa s s Filte r) Fre q = 1000Hz
1.Ordnung (0.707)
Q = 0.2
Q = 0.5
Q = 0.707 2.Ordng.
Q = 10
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.
11.1.7 Notch = Notch Filter
This filter reduces a selected frequency down to complete cut-off. Feedback and interfering
frequencies are reduced.
The Q-factor determines the slope of the filter.
The Q-factor of notch filters is usually between 0.1 and 20.
After changing the type of a filter the value of Q is set to the default value 4.318.