I'm going to dump some more random thoughts I have. This is going to be a hoot.
The purpose of trying to achieve good sound quality is not to please measurement rigs, but to please our individual tastes. I define good sound quality as sound that fits your tastes the best, not what measures best. A high sound *quality* ( low distortion, fast transients, good frequency extension, adherence to generalized response targets etc.) does not ensure high sound enjoyment. Do they more often than not correlate? Maybe, but it is not definitive.
Science is a tool, nothing more. It does not dictate the experience of reality. Our consciousness does, and while we may think we have a pretty firm grasp on the scientific side of audio, we don't understand the role of consciousness at all, because it cannot be quantified. We can identify patterns of what appeals to most people, but no further than that. Measurements can help inform you why something sounds bad to you but it can not tell you why you find something to sound preferential despite "bad" measurements. We are arrogant to believe we have identified all the factors that constitutes sound, particularly sound that pleases us as human beings but more specifically as individuals.
Ignorance is bliss and ignorance isn't a vice in audio (aside from potential economic loss, but we aren't in this to make incredible deals).
I enjoyed my first crappy piece of gear (probably some Skullcandy IEM back in 2011) and the enjoyment I derived from it then isn't invalidated today just because I have listened to million dollar speaker setups in the recent years.
So...
I'm literally sitting here comparing the copper cable and the silver cable on my FiiO FD5, an IEM that many hold as particularly sensitive to cable material. Even if it is a sighted comparison, all I have to do to gauge the difference is to focus on the bass "fatness" and impact and think to myself:
"Am I satisfied now while listening? Do I get the thump that I expect, crave and know can be there? No? Ok, changing cable immediately. Same test. Am I getting it now? Yes, there it is. What changed? I changed cable. What cable am I using? Copper."
There are other differences as well as I mentioned in my previous post, but the bass and general engagement factor is the most obvious telltale and it is simply neutered through the silver cable. I feel this way every time without fail, and it is a pattern for me among all the silver cables I've tried. Are there any IEMs or headphones where I would prefer a silver cable? Yes. The Audioquest Nighthawk is one of them as it is excessively warm and dark without one.
There's nothing that science can show me go debunk this conclusion of mine because the conclusion isn't drawn from a scientific method. We do not apprehend or experience reality through a scientific lens, that's not the norm, that's not how we operate. Even if you say it's placebo or delusion, the fact that I feel strongly about my experience does not go away. The experience is real. You don't enjoy a product because it measures good or because it can be measured at all, you enjoy it because you enjoy it.
Reality perceived by the conscious human mind >>>>>> audio science.