A free app for Android, by Litter Penguin.

Equalizer – Bass Booster & Volume Booster is an Android sound amplifier and equalizer. With this app, you can make your music more interesting. The main function of the app is to amplify the bass and the volume of your device. This can help you enjoy the music and make it sound louder. This app is easy to use. You can set the volume to the desired level and change the bass and the sound. The app has a 3D virtualizer, which can be used to create a stereo effect. This can enhance your music listening experience. You can change the music genre and use the volume booster to boost the bass.