Technically Tripping Over Feet
One of the most contentious nerd debates online is about audio quality, and those that believe there are no differences in quality always point to AB tests as their primary justification.
This guy explains why this is fatally flawed, and he nails it:
http://www.aletheiaaudio.com/Double-Blind-Testing.html
I already put this link into our Save The Audio series. Good stuff.