Ok, but my question was if all sound is bad, or just music. If all sound (including ringtones, notification tones, game sound effects, etc.) is bad, then your device may have faulty firmware or sound processing software. If it's just the music, then it may have to do with the music app that you're using to play. I'm not sure what you mean when you say you don't use an app--if you're listening to music on your device, you're using some kind of app to listen to that music (like Google Play Music, for example).