I just found this comment that pretty much sums up my situation; I just got a brand new Macbook Pro 17″ three days ago. I am happy about everything except the speakers. The sound is distorted and on certain frequencies the chassis vibrates. This makes listening to some kinds of music (just to name one: solo piano, either jazz or classical, which tends to have wide dynamics and resonance) almost unbearable. Of course I never expected the audio of a laptop to be five-star HiFi; but having owned a MBP 17″ of the previous 'silver key' series, I know that things weren't this bad. On my older machine I could listen to anything, even at top volume, with a clean, round, reasonably good sound. The new one in comparison sounds tinny and fuzzy like a giant FM radio. I either bought a lemon or there has been a noticeable fall in quality, at least regarding this aspect. I may just suck it up... Not sure yet... ... https://www.youtube.com/watch?v=n7x2uWmAh3A