Sound quality is quite good with both speaker an earphones thanks to settings included by Sony. The sound is incredibly loud with integrated speaker and does not show any sign of weakness. The sound is so loud that I don't need XLoud.
But the speaker is quite focused on high tones. That's the only "bad" thing.
1. Alcatel OT-552 > Dead
2. Sony Ericsson W302 > Boken screen
3. Sony Ericsson Zylo (W20i) > Dead
4. Xperia Mini Pro (SK17i) > Need to repair it
5. Xperia L (C2105) > Hope it will last longer