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The particular frequency to which a given filter-band in an equalizer is tuned to. Parametric equalizers are able to sweep the center frequency, providing a greater degree of flexibility to the EQ, while graphic EQ's have a number of fixed center frequencies. The amount of boost/cut that can be applied to the center frequency will also affect adjacent bands to a greater or lesser degree, based on the "width" or Q that is set on the filter.

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