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And why do you think DBTs are "invalid"?

Audio DBTs test whether there is an audible difference between two sources, to some listeners, in some system, at some time. That's it - yes or no. A positive result means there was probably an audible difference to those listeners with that system, a negative result, probably not. Exactly what do you think is invalid about that?

If from such a negative result you infer something like that all cables are the same, yeah, that's invalid - but again, no one does that. Instead they use it as a valuable but limited piece of evidence in their overall understanding.

Sighted test results are the same - no general applicability - but one has to remember that the results in that case might be affected by expectation bias. Since we know expectation bias is quite powerful, such tests don't add much to our knowledge of what's audible. That's why DBTs are useful.

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