I'm sorry, but that seems particular to your machine. I find that mine plays iTunes music solidly. The sound is certainly inferior and low but at half level I still hear music. Is something blocking your speakers? They're right where your screen meets the keyboard. Try plugging in a set of earphones. How is the sound now? Try playing a cd, a dvd, and some music content off the Internet. In other words, try different qualities of recordings. How does it sound now? If you're still unsatisfied and live in a city with an Apple Store, you could make an appointment with one of those Genius Bars and have Apple's people tell you what the story is. But, in short, I think your machine may have an issue.