Kurzweil K2661 Musician's Manual page 511

Two-pole Highpass Filter (HIPAS2)
10
20
10
0
C 2
-10
-20
-30
-40
-50
This is very similar to HIPASS. The primary difference is in the steepness of the rolloff at the
cutoff frequency. Below the cutoff frequency, the rolloff is similar to that of HIPASS, except that
there's a one-octave shift—that is, HIPASS with a cutoff frequency of C 3 will sound nearly the
same as HIPAS2 with a cutoff of C 4. In other words, HIPASS gives you greater attenuation of
low frequencies when set to the same cutoff frequency as HIPAS2.
Four-pole Highpass Filter with Separation (4POLE HIPASS W/ SEP)
10
10
5
0
-5
-10
-15
-20
-25
-30
Frequency in Hertz
100
Frequency in Hertz
100
C 2
Resonance = 0;
separation = 0;
cutoff frequency
from C 2 to C 6
1000 10000
C 7
Resonance = 0 dB;
cutoff frequency
from C 2 to C 7
1000 10000
C 6
DSP Functions
The DSP Functions
100000
100000
16-15