Usually, the centre frequency of each band will be an International Standards Organisation (commonly referenced just by its initial letters: ISO) standard frequency. Each channel will have either ten, fifteen, or thirty-one (sometimes only thirty) frequency bands. It will usually have two identical channels (although some single-channel graphics are available, and have their uses). Generally it will be between 1U and 3U in height. Physically (except on most digital mixers, which typically use channel faders for graphic EQ control), it is usually a 19” rack-mounted box with vertical faders, each controlling a limited frequency range. The Graphic EQ is ubiquitous, and almost essential in any PA system.
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