When the ears/brain detect a meaningful REAL information qualities about two nuanced singing sopranos voices, no tool can qualifies these voices "harmonious" or not so harmonious blending... A tool can detect information, not qualify it as meaningful by itself...A musician can OBJECTIVELY qualify the blending of two feminine voices nuances and not only that he can detect their blending in time 13 times more precisely than Fourier analysis can predict.. Why ? because the ears /brain of the musician is trained to recognize the MUSICAL QUALITIES as an OBJECTIVE reality that can be TAUGHT...
NO need for a blind test...Now tell to this musician , that he cannot trust his ears to pick an amplifier but ONLY the measured verified specs , not even with all possible measures, but only with the limited set of linear Measures proposed by Amir, and say to this musician that to choose an amplifier , nothing else will warrant musicality than these limited set of measures... He will laugh... 😊For sure as he said Amir listen too...But biased by his numbers he listen as if they were predictive of musicality... They cannot.. And he want to blind test anyone saying that his set of measures is not all there is to say about the gear not only about his material design but about his sound qualities... He goes too far with his claim...
The limited set of measures proposed by Amir are useful to verify the company specs claims... NOTHING ELSE... Musical quality must be perceived and cannot be predicted and interpreted by tools without ears, sometimes musical quality correlated with some measures, sometimes not... Design is not only an industrial process it is also a guided by the ears craftmanship and by psycho-acoustic principles and laws of hearings and the law of hearings are not Fourier frequencies based but based on an ecological theory as Gibson did for visual theory ...Fourier is good but not enough...
Why ? Because any prediction must be based on an interpretation space... The Fourier interpretation space as tool cannot predict which is out of his linear window frame of interpretation, but pertain to the time dependant real world event of natural sounds and which qualities the ears perceive non linearly... QUALITIES as objective phenomena... Music is the main example... Measuring the linearity of a well working circuit did not predict musicality as qualities perceived non linearly by ears...