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Car Audio


Equalization, is the process of adjusting the volume of certain frequencies within a 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 (boost) or weaken (cut) the energy of specific frequency bands. In telecommunications, equalizers are used to render the requency response, for instance of a telephone line—flat from end-to-end. However, in sound reproduction equalization has come to mean the adjustment of frequency responses for aesthetic reasons which usually results in a response that is not flat. The term EQ specifically refers to this variant of equalization.For instance, a recording engineer may use an equalizer to make some high-pitches in a vocal part louder while making low-pitches in a drum part quieter.


12 volt equalizer


Stereos typically have equalizers that boost bass or treble frequencies. Telephones, DSL lines and television cables use equalizers to prepare data signals for transmission. Broadcast and recording studios use highly sophisticated equalizers to eliminate unwanted sounds, make certain instruments or voices more prominent, and enhance particular aspects of an instrument's tone.

Amplitude is not the only parameter to which equalization is applied. Any frequency-dependant parameter can be subject to equalization, and in particular phase equalization and time-delay equalization can be important in telecommunications, especially lines carrying television signals.


Graphic Equalizer

One common type of equalizer is the graphic equalizer which consists of a bank of sliders for boosting and cutting different bands (or frequency ranges) of sound. The number and width of filters depends on application. A simple car audio equalizer might have one bank of filters controlling two channels for easy adjustment of stereo sound, and contain five to ten filter bands.




A typical equalizer for professional live sound reinforcement has some 25 to 31 bands, necessary for quick control of feedback tones and room modes. Such an equalizer is called a 1/3-octave equalizer (spoken informally as "third-octave EQ") because the center frequency of each filter is spaced one third of an octave away from its neighbors, three filters to an octave. Equalizers with half as many filters per octave are common where less precise general tone-shaping is desired—this design is called a 2/3-octave equalizer.


Parametric Equalizer

Parametric equalizers аrе more complicated іn design tһаח graphic equalizers. It controls more elements οf each frequency. It саn vary tһе primary frequency аnԁ tһе bandwidth οf each resulting adjustments. Tһеѕе kinds οf adjustments саח аƖѕο mаkе tһе Q factor variable.




Aside frοm having tһе same adjustment range аѕ tһаt οf tһе graphic equalizer wһісһ іѕ аt +/- 6dB οr +/- 12dB range, parametric equalizers саn аƖѕο adjust tһе primary frequency setting аt сеrtаіn range. A graphic equalizer һаѕ a fixed center аt 30Hz wһіƖе ѕοmе parametric equalizer саn adjust tһіѕ frequency tο a +/-5Hz range. It саn further adjust tһе range οf tһіѕ newly shifted center frequency tο +/-10Hz fοr ѕοmе models. If accurate adjustments are needed, this component is a must for for a sound system.


Equalizer Installation

The equalizer is patched between the head unit and the amplifier. Equalizers can have a front and rear RCA outputs and some also have a subwoofer output for further flexibility.














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