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Center Frequency

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.

frequency band

A range of frequencies, as defined by a regulatory authority or by commonly accepted usage. In audio, the term usually refers to equalizers, in particular graphic EQ's. In telecommunication, a frequency band is a specific range of frequencies in the radio spectrum. Used in wireless microphones.