@hilde45 @kerrybh :
This "objective" vs. "subjective" debate is, to my mind, central to audiophilia. To rephrase: is the point of an audio system to reproduce what the original performance sounded like (that would be an "objective" standard, however it is to be measured and confirmed)—or, rather, is the point to please the listener (that, obviously, would be the "subjective" goal)? Those who favor measurements are, I think, looking for an identifiable "objective" standard. And surely, the engineers who designed the equipment relied on measurements, so they must be relevant. And yet: what is the "original performance"? Even if it’s the sound of a particular acoustic instrument or voice, one still must ask: heard where? What were the acoustics of the "original" listening environment? What did the recording engineer add to or subtract from that original sound?
And so, psychoacoustics must come into play. Everyone’s hearing, especially at our advanced ages, is different. If it sounds "good" to you, that doesn’t mean that it must also sound good to me, since my ear-brain-mind complex is going to be different than yours. A very well-informed friend who has spent a lifetime in the music business in various capacities (as performer, recording engineer, remix master, audio salesman) insists that it’s all a matter of whether or not you like sriracha sauce with your tacos. Some do, some don’t. Chacun a son gout.
Then again: in making purchasing decisions, most of us read reviews, etc., because we want to make "informed" choices. That means, we want to seek out components that are more likely to give us positive results than random guessing. So there must be some kind of "objective" standard here, otherwise this whole audiophile phenomenon is just a charade.
Our fetish is like any other (e.g., oenophilia). There are "objective" standards that the "experts" adjudicate, and the rest of us mostly aim to adjust our impressions to those standards. But it need not be so. I used to make coffee with tap water. When a friend, also fond of coffee, suggested I should use filtered water, I agreed in principle, tried it—and preferred the taste with tap water! But I knew this had to be "wrong." So I continued to brew my coffee with filtered water. Now, I’d never consider using tap water. Maybe I’ve just made my life more complicated.