Free Android maximizer sound output bass & volume booster is free and small
this app work in background its operate with various sound activities:
video callsaudio playervideo playeraudio bookscars and vehicules multimedia bluethoot and all bluethoot system.
enjoy watching videos & music play song mp3 with better sound quality hearing
doesn't require any extra download

Volume sound maximizer will make your phone sound and overall volume stronger

You can freely customize the volume to fit your requirements

This app also works with your headset headphone and speaker

Practical for hard hearing people who suffer from hearing disorders.