Equalization (audio) facts for kids
In sound recording, equalization is the process commonly used to change the frequency response of an audio system using linear filters. An equalizer is the device which is used to control the frequencies.
Images for kids
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A stereo graphic equalizer. For the left and right bands of the sound content, there are a series of vertical faders, which can be used to boost or cut specific frequency ranges. This equalizer is set to a smiley face curve, in which the mid-range sound frequencies are cut.
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Equalizers are also made in compact pedal-style effect units for use by electric guitarists. This pedal is a parametric equalizer.
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The very uneven spectrum of white noise played through imperfect speakers and modified by room acoustics (top) is equalized using a sophisticated filter using digital hardware (bottom). The resulting "flat" response fails, however, at 71 Hz where the original system had a null in its response which cannot be corrected.
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The equalizer-section from the Audient ASP8024 Mixing console. The upper section has high and low shelving EQ, the lower section has fully parametric EQ.
| Selma Burke |
| Pauline Powell Burns |
| Frederick J. Brown |
| Robert Blackburn |