Quote Originally Posted by musicoverall
... A correct interpretation of a null result is, quite simply, "the testee was not able to distinguish the two devices under test on this day, with this system, with the music chosen, with the system used, and with the testee's particularly state of mind at the time". It doesn't mean the two devices sound alike, no matter how many trials were involved. It's hard to read much into that.

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In essence a DBT/ABX cannot prove that the tested components sound identical.