Electronic measurements of gear did not correlate linearly and perfectly well with listenings impressions...
Paradoxically, any designer must use very precise set of recognized standards measurements as general starting point but they use after that their alchemical electrical art... But it is an art, a craft, not a mere learned technological recipe .... They learned to put complex parameters together and figure out by experience how playing with them to make miracles happen..
Nelson Pass or Atmasphere for example are artists too not just engineers..
But there is a more exact correlation between acoustic and psycho-acoustic measurements and subjective experience... Exemple : Smyth realizer or virtual room acoustic with Dr. Choueri are based on acoustic and psycho-acoustic measurements ...
Then subjectivist and objectivist see half of the truth and are blind to the other half... They forget that the gear components must be acoustically embedded in a room to be LISTENED TO OPTIMALLY...