Last summer NPR posted a story entitled ”How Well Can You Hear Audio Quality?” that let users “blindly” compare six different tracks recorded at identical volume levels at three different qualities: MP3 at 128 Kbps, MP3 at 320 Kbps, and uncompressed WAV. The goal was to see if listeners could discern the quality difference and then correctly pick which version was WAV.

After thousands of results it turns out that people can tell the difference. But just barely.