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A graphic equalizer can provide up to 18dB of boost or cut for each frequency band. The center frequency of each band is fixed at standard ISO frequencies. The bandwidth of each filter is fixed and depends on the number of bands in the equalizer. Graphic equalizers are available in a number of octave sizes, including one octave, 2/3 octave, and 1/3 octave.
In a digital system, a graphic equalizer is, in most applications, less efficient than a parametric equalizer. Each band of a graphic equalizer uses approximately the same DSP resources as a single parametric equalizer band. we recommend that parametric equalizers are used when possible. The main advantage of a graphic equalizer over a bank of parametrics is its ease of setup and use.