40
20
0
-20
-40
-60
-80
dB
10
100
1000
10000
Hz
40
20
0
-20
-40
-60
dB
10
100
1000
10000
Hz
40
20
0
-20
-40
-60
dB
10
100
1000
10000
Hz
40
20
0
-20
-40
-60
dB
10
100
1000
10000
Hz
HL
7.
bandpass mode.
Obtained by cascading a 12dB/oct
highpass and a -12dB/oct lowpass filter with two reso-
nant peaks at both ends of the passband. At higher span
settings the response is near-flat in the frequency range
between the resonant peaks.
HN
8.
highpass mode with additional notch in the
passband.
The characteristic is of a 12dB highpass.
However, one core is employed to create a notch in the
range above the corner frequency of the highpass section.
BH
9.
ba highpass mode.
The characteristic is of
a 2-pole highpass, but the first core is operating in band-
pass mode, thus offering an additional formant bump in
lower frequencies. Thanks to phase cancellation when
mixing the cores, there is an audible gap in the frequency
range between lower and higher peaks. For frequencies
below the lower peak, the response is +6dB/oct.
HH
10.
double slope highpass mode.
The frequency re-
sponse is near-flat for high frequencies. It offers a +12dB/
oct slope in the frequency range between peaks and a
st24dB/oct slope for frequencies below the first
peak. With span turned to zero it behaves like a classic
4-pole highpass filter, whereas with span turned to the
max it behaves like a 2-pole highpass filter.
7
