In sound recording and reproduction, equalization is the process commonly used to alter the frequency response of an audio system using linear filters. … Since equalizers “adjust the amplitude of audio signals at particular frequencies,” they are, “in other words, frequency-specific volume knobs.”
Improve your phone or tablet’s sound quality with the best Equalizer app. Music Equalizer lets you adjust sound effect levels so that you get the best sound.
How to Enable Audio Equalizer When Playing Music Video On Youtube