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  1. A circuit or device that allows the user to adjust the amplitude of a controlled range of frequencies without affecting others. Example: the bass and treble controls on a home or car stereo system are equalization controls. Each allows you to adjust one part of the frequency spectrum by cutting (turning down) or boosting (turning up) that part. Very sophisticated equalizers allow the user to determine the frequency, how much it affects the surrounding frequencies, and the cut or boost of the signal. Source: Church Audio & Acoustics Glossary
  2. A device for adjusting the frequency response of a device or system. Source: http://www.owenscorning.com/around/sound/glossary.asp

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