A free program for Android, by Parzival Inc.

SoundMax Equalizer & Bass Booster is the best Equalizer and Bass Booster app for Android. The app allows you to adjust the sound level and the frequency of the sound in your audio files. You can also disable the Equalizer and Bass Booster and use your device’s built-in speaker to play your music.

This is a music player with a built-in Equalizer and Bass Booster. 

The app allows you to use various presets, including classical, pop, rock, metal, hip-hop, jazz, and more.

This app also allows you to use virtualization, which creates a 3D sound effect. You can also use the volume slider to adjust the volume of the music. SoundMax Equalizer & Bass Booster allows you to listen to music in all of your apps.