If Your android phone is old you get your speaker sound is very poor.if you want make your android speaker much better just use this Android Speaker Clean app..it will make good result on your phone

android Speaker Clean

Cleaning your speakers can be tricky. This is because there are a few parts on the speakers you have to clean. You have to be careful when you clean your speakers because some of the parts are delicate and you do not want to damage your speakers. You should clean your speakers periodically so they will give you the best sound possible

 watch  how to clean speaker your android phone

Download Android Speaker Clean 1.9 APK