Superior sound quality is something that everyone looks out for in a smartphone. How convenient would it be if your smartphone delivers an unadulterated sound quality like a commercial music player. Most Smartphones lack this edge. However, the main advantage of having an Android smart phone is MODs! The amounts of MODs available are insane. And most certainly there is an MOD to improve sound quality too called as ACID Audio Engine. Similar to Beats Engine, ACID improves the sound quality of the device with some extra features. Credits go to Recognized Contributor at XDA, Knight47.