Click here to purchase the entire book in PDF format. Sweep Filters These equalizers are most commonly found on the input stages of mixing consoles. They are generally used where more control is required over the signal than is available with graphic equalizers, yet space limitations restrict the sheer number of potentiometers available. Typically, the equalizer section on a console input strip will have one or two sweep filters in addition to low and a high shelf filters with fixed turnover frequencies. The frequencies of the mid-range filters are usually reciprocal peak/dip filters with an adjustable (or sweepable) center frequencies and fixed Q's. The advantage of this configuration is a relatively versatile equalizer with a minimum of knobs, precisely what is needed on an overcrowded mixer panel. The obvious disadvantage is its lack of adjustment on the bandwidth, a problem that is solved with a parametric equalizer.