An equalizer made up of multiple attenuators set (centered) on evenly spaced (fixed) frequencies throughout the audio spectrum and affecting a fixed range of frequencies around them. The controls allow the frequency to be cut or boosted at these frequencies. There are three typical types: controls centered on 1-octave intervals, controls centered on 2/3-octave intervals, or controls centered on 1/3-octave intervals. The narrower the separation, the more control the unit gives.
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