How to Use an Equalizer

How to Use an Equalizer

Equalizers are found in your phone, audio player, theater system, and car, but it lacks an instruction manual. With a little knowledge, you can tweak your audio and fall in love with it all over again.

The primary function of an equalizer is to adjust the loudness of specific frequencies. The basis is actually on the human ear just with all sound engineering. Despite having the same energy, certain frequencies are louder in the ears.
Equalization allows balancing of frequency components within an electrical signal. The device used to apply equalization is known as an equalizer. It works by boosting or cutting the energy of frequency known as bands. Often times, we are most familiar with the equalizer in our cars. It allows you to boost bass and treble frequencies. It has relatively limited capabilities.
There are many functions perform by the equalizer, but the main function is to adjust the frequency response of audio captured by microphones. Equalizers can have a profound effect on the quality of a mix. Equalizers are many, and choosing the right equalizer is dependent on what options are available and how each function.

1. What is an Equalizer Used For?

  • It can be used as a creative tool or a correction tool, depending on your use of the device. Some of the uses are:
  • It helps in removing some frequencies to enable sound mix well. It can cut the frequencies of a guitar in order to create more room for guitar’s frequency content
  • It is used to zoom in problem frequencies.
  • Separate two recordings that would otherwise sound similar can be helped by the controls on the mixing console.

Equalizers have the ability to boost and isolate certain frequencies. As an audio filter, it can lower frequencies and also leave them unchanged. They are found in different arrays of electronic devices such as


  • Studio mixing board
  • Guitar pedals
  • Car stereo system
  • Home stereo system 
  • Guitar pedals or rack effects
  • Studio mixing boards
  • Instrumental amplifiers (guitar, bass, keyboard, etc.)

It can also change the color of an audio signal and make vocals more articulate by boosting the treble frequency range. By boosting base frequencies, it can make a song sound deeper. It can be used to remove high pitched buzz of the fluorescent lighting fixture.


An equalizer can make vocals more articulate by boosting the treble frequency range. Sometimes, it can be used to remove certain sounds from a recording, like the high pitched buzz of fluorescent lighting fixtures.


Now that you know how an equalizer works and how it solves certain problems, you can mix audio tracks and highlight vocals, solo instruments, and a rhythm section to your liking. By providing a sufficient boost or reduction to those frequencies, the outcome won’t hinder the main musical composition.

2. What does an equalizer do?

For certain frequencies to be emphasized over others, an equalizer will adjust audio output through linear filters. Below are some popular types of equalizers.
Parametric equalizer: This type of equalizer has three controls. The specific frequencies you want to boost or cut is determined by the first control. The second one determines the sharpness of the bandwidth, and it is called the Q. The level control is the third one, and it is defined by how much you would want to boost or reduce a frequency. The three types usually exist in the form of digital software.
Graphic equalizer: This is very important as it is found across a wider range of devices such as personal stereos, amps, pedals, mixing boards. It is different from the parametric equalizer because it is not precise. Each band within the equalizer is assigned a specific knob. One can only boost it after checking out the knob. The bands within these equalizers are treble, mid, and bass. While some graphic equalizers have three bands, others have up to five bands.

High-pass filters and low-pass filters: Just as the names imply, these are very simple. High pass filter blocks out low frequency allowing high frequencies to pass through unencumbered. On the other hand, a low pass filter does the opposite. It blocks out high frequencies and allows low frequencies to pass through.

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