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I have a Dell XPS 15 l501x, its known for its excellent JBL speakers and the sound is truly tremendous and impressive. However when I crank up the volume more than halfway the right speaker starts making a rattle like grains of sand resonating in high pitched frequencies on glass. When i put the palm of my hand on the right side of the keyboard, where the sound seems to be being produced the high pitched rattle goes away, or at least highly minimized. What is this, and is this a hardware issue related to the speaker? Or something more simplistic? I have recently vacuumed the keyboard as well to make sure its no physical particle making the noise. Thank you!

Btw. the laptop is still in warranty so I could have it looked it if I need to.

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Well, the only way to know for sure is to take a look at the speakers. To do that you will have to disassemble the laptop though, which if you are willing to do may reveal more clues. –  jmreicha Oct 13 '11 at 13:08
    
I figured it out, it was some of the keyboard keys which is lame because there is no real solution other than to put something on the keys when you want to crank it up. –  Mohammad Oct 13 '11 at 20:48

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