Check your music app settings
For every phone, there is an app that plays music. You should check the app’s settings and make necessary adjustments. Have it in mind that the audio won’t go beyond that of the manufacturer’s setting
Buy a dedicated accessory
This is another way to boost the sound of your smartphone. You can buy a dedicated accessory like a headphone. With this, you don’t have to always rely on the sound of your phone. The caution here is that you should not tune it too high. This can be dangerous.
Install an equalizer app
Not all music app come with an equalizer. An equalizer is usually used to boost the sound on your smartphone. You can download one as there are so many online. Alternatively, you can get a music player with an equalizer.
Update your phone
Updates to apps are usually made intermittently. So, your smartphone audio quality may be poor because you have not updated your apps. Try and update your music player to the latest version. There is a very high possibility that your audio quality will significantly improve.