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RE: Or the subjects?

You are imposing unnecessary conditions to come up with these problems.

>>> It's quite possible that one set of listeners would not any difference in a DBT/ABX, whilst a different set of listeners DO pick up the deltas.>>>

This is only a useful test when done with listeners who claim to hear differences under sighted conditions. Differences that are being questioned as to their veracity. There is nothing about a properly designed ABX DBT that would cause *these* listeners to lose their hearing acuity when doing an ABX DBT. So "the set" of listeners you are hypothetically imposing on the test should not even be tested.

>>> DBT/ABX can help sort out some macro deltas, but IMHO, is useless for more critical listening.>>>

How does ABX impede critical listening? It doesn't. There is no kind of unique "critical listening" that can be done sighted but not done in an ABX DBT. There are no limitations to ABX listening. In an ABX DBT the person taking the test knows what A is, knows what B is and can compare them as much as they like sighted to establish what the differences are before trying to determine whether X is A or B. How could this possibly in any way prevent any kind of critical listening?


>>> The test may not show any deltas in one listening environment, but does show deltas in a different environment.>>>

Again this is an arbitrary and unnecessary condition imposed on the test. If there is a questionable claim of audible differences the ABX test should be done under the conditions which the alleged audible differences were heard. No reason to impose some other listening environment.


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