Kurzweil K2500 - PERFORMANCE GUIDE REV F PART NUMBER 910251 CHAP 14 Function Manual page 11

4-Pole Lowpass Filter:
Resonance
4-Pole Lowpass Filter:
Separation in Octaves
This combines 2POLE LOWPASS and LOPAS2 in one three-stage function. The parameters on
the F1 FRQ control input page affect the cutoff frequencies of both filters. The parameters on
the F2 RES page affect the resonance of 2POLE LOWPASS. The parameters on the F3 SEP page
shift the cutoff frequency of LOPAS2, creating a separation between the cutoff frequencies of
the two filters. Positive values raise the cutoff frequency of LOPAS2, while negative values
lower it. If no separation is applied, there's a 24 dB per octave rolloff above the cutoff frequency.
EditProg:F3|SEP(4P|LOPASS)|<>Layer:1/1||
Adjust:0ct||||||||||Src1||:OFF||||||||||
Fine||:0ct||||||||||Depth|:0ct||||||||||
||||||||||||||||||||Src2||:OFF||||||||||
KeyTrk:0ct/key||||||DptCtl:OFF||||||||||
VelTrk:0ct||||||||||MinDpt:0ct||||||||||
||||||||||||||||||||MaxDpt:0ct||||||||||
<more||F1|FRQ|F2|RES|F3|SEP|F4|AMP|more>
10 100
20
10
0
-10
-20
-30
-40
-50
-60
Cutoff frequency = C 5;
separation = 0;
-70
resonance from -12 to 24 dB
-80
10 100
20
10
0
-10
-20
-30
-40
-50
-60
Cutoff frequency = C 7;
-70
resonance = 12 dB;
separation from -2 to +2
-80
Frequency in Hertz
1000 10000
24
-12
Frequency in Hertz
1000 10000
-2
DSP Functions
100000
100000
+2
Filters
14-11