Steven Sullivan wrote in message news:d_XUa.142496$GL4.36308@rwcrnsc53...
Thomas A wrote:
Is there any published DBT of amps, CD players or cables where the
number of trials are greater than 500?

If there difference is miniscule there is likely that many "guesses"
are wrong and would require many trials to reveal any subtle
difference?

There are published tests where people claimed they could hear the
difference sighted , but when they were 'blinded' they could not.
In this case the argument that 500 trials are needed would seem
to be weak.

Yes, that's for sure. But how are scientific tests of just noticable
difference set up? A difference, when very small, could introduce more
incorrect answers from the test subjects. Thus I think the question is
interesting.

However, a real and miniscule difference would certainly be
discerned more reliably if there was specific training to hear it
beforehand.

Yes, but still, if the difference is real and miniscule it could
introduce incorrect answers even if there is specific training
beforehand. If there would be an all or nothing thing, then the result
would always be 100% correct (difference) or 50% (no difference).
What if the answers are 60% correct?