Equalizer

Equalizer, or EQ is sophisticated frequency control, which allow you to boost or minimize a range of frequencies, At its simplest, an equalizer divides audio signals into low, mid, and high frequencies. For example, you could increase the gain on the bass (the low frequencies) in your favorite dance music.

A common type of equalizer is the 1/3 octave equalizer, sometimes called a graphic equalizer. The graphic equalizer has 31 control points over the 10 octave to raise and lower the gain of the center frequency labeled above the control.