Recording

Purpose for EQ'ing

The Music Telegraph | Text 2023/10/16 [18:49]
Recording

Purpose for EQ'ing

The Music Telegraph| 입력 : 2023/10/16 [18:49]

 

© Pixabay



Purpose for EQ'ing

 

Every instrument has its own sound called "tone" or "timbre". It can be thought of as the color of a sound. It is the energy arrangement of the harmonics of an instrument that give it its color and this is determined by how the instrument is designed and played. A trumpet sounding the note 'A' sounds nothing like a guitar playing the same note at the same volume because their timbres (harmonics) and envelopes are different. An equalizer is a device that can alter the harmonic content and hence the tone or timbre of a sound.

 

The three fundamental characteristics of an equalizer are,

  • The frequency that is being boosted or cut (called "center frequency", fc described in Hz).
  • The amount of boost or cut at the center frequency (called "gain", + or - measured in dB).
  • The amount of frequencies on either side of the center frequency that are being affected (known as "bandwidth" or "Q"). Q is the ratio of the frequencies affected (bandwidth) divided by the center frequency. (refer to this article) The smaller the Q number (e.g. 0.5), the larger the EQ range affected, the larger the Q number (e.g. 3), the smaller the EQ range affected.

 

The more control you have over the three EQ parameters (fc, gain, Q) the more complex but flexible the EQ processor will be. In the past, all equalizers were analog circuits that were manually controlled by knobs, sliders and buttons. Being able to reset them from one project to the next was always a concern. Today, with many of the processors designed as virtual plug-ins for computer applications, not only are resetting issues a thing of the past, but dynamic parameter changes can be automated, allowing for an incredible degree of control and creativity. The true power of an EQ lies in your ability to hear frequencies, relationships, and tonal nuances within an instrument and a mix.

 

 

 

 

 

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