Kurzweil K2600 Musician's Manual page 509

Equalization (EQ)
Equalization is a specialized Þltering process that lets you boost or cut the amplitude of a
speciÞed range of frequencies.
Parametric EQ
Mid-range Parametric EQ
Bass Tone Control
Parametric Equalizer (PARAMETRIC EQ)
This function has three interacting parameters, each with its own control-input page: center
frequency, width, and amplitude. The center frequency is the center of the range of frequencies
that will be boosted or cut by the amplitude setting. The width is the entire range of frequencies
that will be affected by the amplitude setting. For the K2600, the width is deÞned by imagining
an amplitude curve with a level (in dB) of -inÞnity (minus inÞnity) at the center frequency, then
measuring the distance (in octaves) between the points on the curve where the amplitude is
attenuated by 3dB. See the diagram below.
10 100
16
Gain = 12 dB;
width = 2 octaves;
14
cutoff frequency from C 4 to C 10
12
10
8
6
C 4
4
2
0
Treble Tone Control
Steep Bass Tone Control
Frequency in Hertz
1000 10000
DSP Functions
The DSP Functions
100000
C 10
16-25