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The T in the DBT is a bias introduced...

and if these people actually did some real relevant research instead of just reading technical manuals they'd understand it.

Failing a DBT does not mean that people can't tell A and B apart for one and secondly it can never prove that A = B. They reliably give you numbers which are interesting but that's about it.

They base it on probability math. The notion that if you flip a coin you will get 50% heads is preposterous. It is based on past experience trying to predict future results. But there is really only 0% heads or 100% heads. With the tests it is entirely possible that the selector was 100% correct on his "so called" guess and 100% wrong on another guess. However that illustrates only that they can;t CONSISTENTLY tell the differences not that they could not tell them apart at all.

But if we call the differences subtle and we insist on meeting the .05 signifcance level then 6/10 ten times for a total score less one of 59/100 meets significance at the .05 exactly the same as 9/10.

Consider that 6/10 is deemed not better than chance and the test ends. But if we actually run (one person listening only) a high trial test then 6/10 is not a "stop the test" result. No indeed. If that listener gets that 59/100 (6/10 ten times) they have proved they could tell consistently the difference better than chance to the .05 level. And since more trials in this kind of test is better then why are they not done? Incompetence or laziness. The T however removes it on validity grounds because it's not the way people normally listen to music and test stressors come into play.

That said you could make the case that it's still better than sighted listening so you should trust it. Same with some of the drugs on the market - take the cholesterol drug because it may reduce a heart attack - it might also give you liver disease but you play the percentages.

Clearly where a DBT is useful is when someone claims HUGE differences - if that were true then you should be able to beat a 16 trial test.

Still it depends on the claim made as well.

"I can always hear a difference between cables" is different than
"I think cables make a very slight improvement but I probably could not always tell them apart a lot of the time"

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  Kimber Kable  

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