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{{about|electronic compensation for systems' uneven frequency responses|equalization particularly as used in sound recording and reproduction|Equalization (audio)}}
{{other uses|Equalization (disambiguation)}}

(contracted; show full)aesthetic reasons, often resulting in a net response that is not truly equalized.  The term EQ specifically refers to this variant of the term.<ref>Ballou, pp.875-876.</ref> Stereos typically have adjustable equalizers which boost or cut [[Bass (sound)|bass]] or [[Treble (sound)|treble]] frequencies. Broadcast and recording studios use sophisticated equalizers capable of much more detailed adjustments, such as eliminating unwanted sounds or making certain instruments or voices more prominent.


Equalizers are critical to the successful operation of electronic systems such as [[Analog television|analog broadcast television]]. In this application the actual [[waveform]] of the transmitted signal must be preserved, not just its frequency content. Equalizing filters must cancel out any [[group delay and phase delay]] between different frequency components.⏎
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== Uses ==

=== Audio and music ===
{{main|Equalization (audio)}}
[[Image:Shelving-eq.svg|thumb|right|200px|Two first-order shelving filters: a -3&nbsp;dB bass cut (red), and a +9&nbsp;dB treble boost (blue)]]
[[Image:Peaking-eq.svg|thumb|right|200px|Second-order [[linear filter]] functions. Blue: a 9&nbsp;dB boost at 1&nbsp;kHz. Red: a 6&nbsp;dB cut at 100&nbsp;Hz having a higher [[Q factor|Q]] (sharper bandwidth)]]
(contracted; show full)[[pl:Korektor (akustyka)]]
[[pt:Equalizador]]
[[ru:Эквалайзер]]
[[fi:Ekvalisaattori]]
[[sv:Equalizer]]
[[tr:Eşitleme (ses)]]
[[uk:Еквалайзер]]
[[zh:等化器]]