page_title: Equalization (audio)
section_title: Parametric equalizer
hierarchical_section_title: Equalization (audio) / Filter types / Parametric equalizer
caption_attribution_description: English: The equaliser section form the Audient 8024 mixing console Polski: Sekcja korekcji miksera Audient ASP8024. Na górze znajdują się górno- i dolnozaporowe korektory półkowe, poniżej dolno- i górnozakresowe korektory parametryczne.
context_page_description: Equalization or equalisation is the process of adjusting the balance between frequency components within an electronic signal. The most well known use of equalization is in sound recording and reproduction but there are many other applications in electronics and telecommunications. The circuit or equipment used to achieve equalization is called an equalizer. These devices strengthen or weaken the energy of specific frequency bands or "frequency ranges".
  In sound recording and reproduction, equalization is the process commonly used to alter the frequency response of an audio system using linear filters. Most hi-fi equipment uses relatively simple filters to make bass and treble adjustments. Graphic and parametric equalizers have much more flexibility in tailoring the frequency content of an audio signal. Since equalizers "adjust the amplitude of audio signals at particular frequencies," they are, "in other words, frequency-specific volume knobs."
  In the field of audio electronics, the term "equalization" has come to include the adjustment of frequency responses for practical or aesthetic reasons, often resulting in a net response that is not actually "flat".
context_section_description: Parametric equalizers are multi-band variable equalizers which allow users to control the three primary parameters: amplitude, center frequency and bandwidth. The amplitude of each band can be controlled, and the center frequency can be shifted, and bandwidth (which is inversely related to "Q") can be widened or narrowed. Parametric equalizers are capable of making much more precise adjustments to sound than other equalizers, and are commonly used in sound recording and live sound reinforcement. 
  Parametric equalizers are also sold as standalone outboard gear units.
  A variant of the parametric equalizer is the semi-parametric equalizer, also known as a sweepable filter. It allows users to control the amplitude and frequency, but uses a pre-set bandwidth of the center frequency.  In some cases, semi-parametric equalizers allow the user to select between a wide and a narrow preset bandwidth.
caption: The equaliser section from the Audient ASP8024 Mixing console. The upper section has high and low shelving EQ, the lower section has fully parametric EQ.
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