Basics of Equalization 3
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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