"Thomas A" wrote in message
newsBUUa.141509$OZ2.27088@rwcrnsc54

Is there any published DBT of amps, CD players or cables where the
number of trials are greater than 500?

I think N = 200+ has been reached.

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

If you look at theory casually, you might reach that conclusion. However,
what invariably happens in tests that produce questionable results with a
small number of trials, is that adding more trials makes it clearer than
ever that the small-sample results were due to random guessing.