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Technical explanations
Slope
The slope is commonly used to describe the
steepness degree of the filter. A higher slope value
indicates a steeper filter.
Boundary
frequency/Cut off
frequency
Cut off frequency (fc) is the frequency either above
which or below which the power output of a circuit,
such as a line, amplifier, or filter, is reduced to ½ of
the pass band power.
Graphical equalizer
(GEQ)
An electronic or DSP equalizer that allows to
increase or decrease (boost or cut) signal amplitude
in a fixed number of frequency bands of an audio
equipment.
Parametric equalizer
(PEQ)
An electronic or DSP equalizer that allows control
over the centre frequency, bandwidth, and
amplitude of so called bell filters for precise
adjustment of the frequency response of an audio
equipment.
Q-factor
This is a so called quality factor which refers to the
width of the bell curve. The higher the Q-factor, the
narrower the bandwidth. A high Q means that only
a very narrow frequency range is affected, whereas
a low Q-factor affects more frequencies.
