I agree - there are distinct lines between "subjective reality" "objective reality" and "just plain lies" - at least some of the time.
Whether a $200 bottle of Sauvignon Blanc "really" tastes better than a $2 jug of Mad Dog is subjective - because, while we all agree that they aren't the same, it's just possible that one of us may like the $2 bottle better (and, in fact, which one is better is a matter of opinion). However, if I take a single $2 bottle of wine and pour half of it into an empty bottle with a fancy label on it, then the fact that the wine is
exactly the same is no longer subjective. We can have a lively discussion about whether one of us thinks it tastes different when poured out of the fancy bottle, but saying that the wine itself is different is just plain not true.
Likewise, it's a fair subjective question about whether the tiny differences in distortion and noise between two high quality amplifiers are audible and, if so, which is better - but, if we actually subtract the outputs of both and get nothing at all, then we've proven that they are
not different, in which case we can't (rationally) continue discussing the differences that aren't there.
In the case of subtle claimed differences between things like cables, while I tend to agree that some tests can be misleading, at the very least I expect the person making the claim to be able to demonstrate that a difference exists that
they can demonstrate. If someone insists that they can hear a difference between otherwise identical silver and copper interconnects, then I'm mot especially interested in how many people, or what percentage of the people tested, can hear a difference what percentage of the time. But, if you want me to even listen to your claim, then I do expect you to show that
at least one person can reliably hear a difference.
If you claim that there's an obvious difference, yet even you can't reliably tell which is which in a double blind test, then I am forced to consider that the most likely explanation is that you were either imagining that you heard a difference - or you're just plain lying.
If even one person out of a room of 500 can reliably tell which is which, then you have proven that there is a difference. However, if out of those 500 people, NOBODY can reliably tell the difference, beyond what they would be expected to get right if they just plain guess, then you have failed to provide any evidence that lends credibility to your claim. And, in the real world, when someone makes a claim, but has nothing whatsoever to back it up, we generally ignore them - or tell them to come back when they have some sort of evidence to prove that their claim is even worth thinking about.
I don't doubt that the guy in the straightjacket thinks silver wires sound better, but he also thinks he's Napoleon, and I have about as much reason to believe he's right about one as the other... so I probably have better things to do with my time than investigate either of his claims...
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but even subjectivity has its limits. when you try to force others to accept you reality, it's not subjective anymore, it's propaganda and delusions.
-"the voices aren't real, there are only you and me in that room" said the doctor.
-"but they're real, they're telling me to buy a silver power cable!" replied the man in straitjacket.
if the guy didn't try to convince so many people about his voices, he would still be living his life without a care in the world. from my point of view it's the same in audio, if the guys weren't trying so hard to convince others about their placebo and claims that contradict any rational experiment, we wouldn't feel the need to tell them how sick they are.
subjective stuff should stay personal. while objective ones can be shared because of how they can be reproduced by anybody.