>>I paused the player and placed it on brass cones (seating position was
lower than rack so he couldn't see under the player and I blocked his view).
Sat down and pushed "play". He immediately was puzzled and
asked me :WHAT DID YOU DO? THE SOUND IS RADICALLY IMPROVED!!!<<
There are several problems with this "conversion experience."
First, by pausing the music and doing something, then starting the music
again, you raised the expectation that you did something to improve the
sonics.
Second, if you are the audio expert here and your buddy is the "
untrained" listener, your buddy faced peer group pressure to hear an
improvement in order to measure up.
Third, your experiment was not done double-blind. In other words, YOU
knew you had made a change and whether you know it or not, your body
language may have been giving your buddy the tip that you wanted him to
notice, were testing him, had some expectation, or that YOU thought the
sonics had improved, which would make your buddy want to please you by
complimenting the change you -- the expert -- had made by pausing the
music, getting up to make a change -- you needed to place the cones -- and
then resuming the music.
This is WHY listening tests must be done double-blind to carry any weight.
If you did this test double-blind and your buddy with his untrained ears was
eable to reliably tell when the cones were in place and when they weren't --
that would be convincing.
Now, since you claimed the chage was so dramatic that your buddy had to
exclaim that the sound was RADICALLY IMPROVED, we should expect that it
would be easy for him to tell the difference in a double-blind test.