The Fundamentals of Equalizers in Adobe Audition
EQ or equalization adjustments are generally used to improve the style of the recording. They allow the user to either emphasize or de-emphasize certain frequencies. BY altering the frequencies using EQs, you can alter audio pieces significantly. In fact, EQ’s can make up for substandard equipment or poor environmental conditions.
Sounds can come in many different frequencies that range from 20 to 20,000 Hz (or cycles per second). Percussion and bass guitars produce music around the 80 to 100 hertz (Hz) range. The human voice falls around 500 to 1,000 Hz range. Finally, the high woodwinds and string instruments are between 2,000 and 5,000 Hz. The wide range of frequencies in audio allows equalizers to separate and manipulate specific sounds in a recording.
In Audition, there are two types of equalizers, the graphic equalizer and the parametric equalizer. The graphic equalizer has better phase accuracy, but slightly less frequency accuracy than the parametric equalizer.
There is a choice between the 10 bands, 20 bands, or 30 bands graphic equalizer, found under the “Effects” tab, in the Filter and EQ option. The graphic equalizer allows users to manipulate audio using three differently sized, preset frequency bands. Specifically, there are 10 bands (one octave), 20 bands (one-half octave), and 30 bands, (one-third octave). The preset frequency bands allow for quick and easy equalization. Furthermore, equalizers with fewer bands allow easier adjustment, and more bands allow for greater precision. To boost a certain frequency, increase the amount of decibels under the “gain sliders” option by moving that frequency’s sliders up. To reduce a certain frequency, decrease the amount of decibels under the “gain sliders” option by moving that frequency’s slider down. “Gain sliders” are the numbers in orange beneath each frequency, shown in the picture below:
The parametric equalizer is found under the Filter and EQ tab as well. The parametric equalizer provides a large amount of control over audio tone. In fact, as opposed to the graphic equalizer, the parametric equalizer allows the user to have complete control over frequency. In fact, when using the parametric equalizer you can simultaneously reduce certain frequencies as well as boost others. You can boost certain frequencies using the parametric equalizer by increasing the decibels using the “gain” controls. To reduce certain frequencies, simply decrease the amount of decibels using the gain frequency. The orange numbers accompanied with “dB” are the gain frequencies depicted in the picture below: