A free program for Android, by FeniKsenia.

Speaker Booster With Equalizer is a handy application for Android devices that can boost the sound of your speakers. It is designed to make the sound louder and more powerful. You will get a chance to adjust the sound to match your own preferences.

With this application, you can boost low frequencies, boost high frequencies, and even adjust the sound to match the type of music or the audio book you are listening to. It can also increase the volume of notifications, alarms, and other messages, which will make them much more noticeable.

To use the application, first, download it from the Google Play Store. You will then be guided through a few simple steps, and you are ready to start using it.