
The specific design and controls of an equalizer can vary greatly, but the basic principle remains the same: to adjust the relative levels of different frequency components in an audio signal.

They can be found in many forms, including hardware devices, software applications, and as a built-in feature in many audio playback systems. Equalizers are commonly used in audio processing to tailor the sound to individual preferences, to correct for imbalances in playback systems, or to enhance the sound of a recording. It allows the user to increase or decrease the level of specific frequency ranges, such as bass, mids, or treble.

An equalizer (often abbreviated as “EQ”) is a tool used to adjust the balance between different frequency components within an audio signal.
