Professional sound-reinforcement graphic EQs generally have 31 bands, and the center frequency of each band is spaced 1/3 of an octave away from the center frequency of the adjacent bands, so that three bands (three sliders on the front panel) cover a combined bandwidth of one octave. ![]() In general, most graphic EQs have between 7 and 31 bands. In general, narrower bandwidth signifies a more precise EQ. Designers of analog EQs must carefully choose the bandwidth of the filter and decide how the bandwidth should vary with gain and how the filters are summed or cascaded. A well-designed graphic EQ creates an output frequency response that corresponds as closely as possible to the curve displayed graphically by the sliders. ![]() A graphic EQ typically consists of a bank of slider controls used to boost or cut fixed frequency bands.
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