Yes I posted on that site too. I have no issues with my audio. At an unbearably high volume I get no distortion.

I also have the Tegra 3 international One X and I experienced some hissing (at high volume, during the silent sections of some tracks) but that was with Beats on. When I took off beats my music played fine. In fact since I got the device a few weeks ago I did not even suspect something was wrong...