How Well Can You Hear Audio Quality? : The Record : NPR "Many listeners cannot hear the difference between uncompressed audio files and MP3s, but when it comes to audio quality, the size of the file isn't (ahem) everything. There are plenty of other ingredients to consider, from the quality of your headphones to the size of the room you're sitting in to, well, your own ears. Can you hear the difference? Take this quiz to find out. One hint: Turn your volume up."
I got 2 out of 6, mostly by non-audio means.