This test is, of course, limited to the equipment with which you perform it. The most important equipment by far is your own ears. I was 16 when the audience was blindly played the same song (by Michael Jackson) from vinyl, CD and DVD on a 1.5 million dollar system. At that time I could immediately tell which medium was being played. Half the people in the room were wrong and it was clearly due to the age of the audience. Meanwhile, I would probably also no longer be able to tell the difference. But If your audio system sucks, you will also have a hard time to Tell the difference in this Test.