Alesis DEQ224 Reference Manual page 47

3
Basics of Equalization
In the next illustration, the difference between a narrow Q and a
wide Q is seen:
Variable Q
Now we're ready for a visual definition of the term Variable Q. In
the next illustration, the wider and more gradual curve represents a
lower gain setting for a variable Q equalizer. The narrower and
more steep curve represents a higher gain setting at the same
frequency:
The previous illustration has been exaggerated somewhat to make
the point, but you can see how a lower gain setting also boosts
frequencies that overlap to some extent into the regions affected
by the next highest and lowest frequency band controls.
Constant Q
In contrast, a Constant Q equalizer has a more consistent range of
frequencies under its control throughout its cut/boost range, as
illustrated below:
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