Here’s how you can customize the audio on your Samsung Galaxy S 3 to suit your own hearing.
1. Tap on your phone dialer.
2. Go to Menu.
3. Go to Call Settings.
4. Go to In-Call Sound EQ Settings.
5. Go to Personalized EQ
6. Plugin your headphones, and run the audio check.
For more information, see the original article at the link below.