Yes, he said that when he plugs headphones into it, that he does not hear the distortion.

However now that I think of it, the headphone output would probably be controlled by the same volume control as the main speakers. So he's probably not ever turning up the headphones very loud.

Also if you plug the headphones output to an external amp's line-in and then turn up the volume really loud, distortion is normal due to the the difference between headphone level and line level, and wouldn't necessarily indicate a problem. So that'd be a tough thing to use for diagnosis.
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Tony Fabris