Graphic equaliser
Graphic equaliser – an equaliser that has a series of preset filters spanning the audio spectrum. Each filter is designed to either attenuate or boost a narrow band of frequencies around a centre frequency. The more bands a graphic equaliser has, the narrower the bands need to be. For professional live applications, it is fairly standard to have a 31-band graphic equaliser. This means that there are around three separate filters for each octave of the audio spectrum. This enables sound engineers to adjust the output of the system to the venue to improve sound quality and reduce the possibilities of feedback.
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