Audio is bound by physics, therefore can (and should!) be measured. The devices reproducing those sounds, also bound by physics, can therefore be measured and quantified. The only part that cannot be 100% accurately measured is your personal response to that reproduction and based on past studies, a very close general approximation can be made. That is at least how I try to approach it now that I understand better. Leave the "veils," and other marketing terms that cannot be measured to philosophers, theologians, and Zak Bagans.