Regarding the link about light, a) what does that have to do with anything? and b) statements there such as "The exact nature of light is not fully understood, although scientists have been studying the subject for many centuries." are plain wrong. Explaining light was one of the first successes of quantum theory many decades ago. The wave/particle duality is a non-issue, since quanta are neither waves nor particles, but things for which we have no analogues in the macro world we sense, and thus cannot relate to directly. That's what the math is for.
Regarding audio codec listening tests, here's the link I recommend:
http://www.rjamorim.com/test/
This guy did the tests by having many people download the setup (an ABC/hidden reference blind test software and sound file set) and perform the tests on their own computers, then send back the results (encryption to prevent cheating).