Pro Audio Equalizer (EQ)

Equalizer (EQ) - A device used to cut and boost individual frequencies of an audio signal using a number of filters. The name "equalizer" comes from the original application of correcting distorted audio signals to sound closer to the original source. Graphic Equalizer and Parametric Equalizer are different types of equalizers used by audio equipment and audio equalizer.

Professional audio application

Professional audio application is commonly used to refer to professional audio engineering and operations, which can include but is not limited to broadcasting radio, audio mastering, sound reinforcement such as a concert, DJ performances, Audio Sampling , public address, surround sound movie theatres, and in some cases piped music application.
Pro Audio equipment typically carries an implied elevation of manufacturing quality and features compared to regular or consumer level audio equipment.