Johan Helsingius wrote:
I once did a blind listening test on an audiophile forum to
see if people could hear a difference between "hi-res" and CD.
As an outlier test, I threw in a 256K mp3 file (decoded to
FLAC, so people couldn't tell from the file format what it
was). The mp3 file came out as the second most preferred of
all 9 alternatives - the "winner" was the 16/44.1 file that
I had increased the volume by 1 dB on... 
** That is a really worthless test methodology.
About 3 decades ago, I came up with a simple and really powerful one that avoided the horrible problems inherent in all A then B or ABX type tests.
Ocne set up, the test takes only a few seconds before the result is clear and convincing.
Unless your test operates in a similar way, it has no credibility with or impact on any listener. The principle is that of INSTANT change-over, while listening in stereo, in your home to your best loved tracks.
Read about it he
http://sound.whsites.net/absw.htm
Got any questions - I'm right here, every day.
..... Phil