original paid apps.
Equalizer, Bass Booster and Volume Booster (Eq & Bass) improve sound quality. Equalizer FX , bass booster and volume booster ( Eq & Bass) can improve the sound quality of your android phone.

You can use any media player (music player, video player, etc.) , the equalizer can also change the original sound quality.

Equalizer , Bass Booster, and Volume Booster ( Eq & Bass) can also increase the volume of mobile phone system, such as media volume, voice volume, system volume, r