I guess we are confusing a few things here.How come it's only for audio that amateurs believe they're as skillful as a pro? Wouldn't you expect working with audio 8 hours a day learns you a thing or two about sound? Can you for example call the frequency of feedback for example, accurate to 1/3th of an octave? When audiophiles describe the tonality of sound it's very clear they're missing that knowledge and training.
Another example is that tests show that I (as a pro sound engineer) am far better in detecting distortion than average. I also attended different blind tests where I immediately called out issues with the test material. It took measurements to convince others of the issue. It has nothing to do with superiority. It's just 30 years of experience working with sound, which is totally different than passively listening to music.
Harman determined 'experienced listeners' can more reliably analyze and describe perceived sound, see Toole's studies. As a result they've setup a training program for their testers. There you have the evidence people can be trained to analyze audio. The same for musicians, who are proven to be better in timing and pitch. Imagine what a pro sound engineer who's also a musician can do.
1. Trained people will, luckily, be able to identify REAL differences earlier, with more words to describe them, and, possibly, have an idea of the cause, since they are trained, indeed.
2. There are more pro audio or musicians with earing issues than within random audiophile crowd.
3. Some differences are not real. If you ask a pro or any skilled person, to tell if they hear them, they are as likely to be fooled than anyone. Maybe more so, because they may think they have to prove their superior skills.
Some differences are very subtle, and they may be able to hear them or think they hear them. Anyway, it doesn't matter if they are real, since it's part of their creative process.
Some might be. Some might not.
Checking gear capabilities is a very complex matter. But basically, it is a solved issue, fully covered by measurements, for more and more layers in the audio chain.
DAC, ADC, power amplifiers, line level preamps: if they measure good enough, they'll sound good.
What is very Imperfect, for sure, is the transducer level: microphones, phono needles (and the whole vinyl production/reproduction chain), headphones, loudspeakers,...
And, therefore, the audio device imediately attached to it should be able to support perfectly the most difficult use cases (as we see more and more for the HP and LS amps) OR to adapt (as an example, with EQ or impedance tuning for phono preamps, or with impedance adaptation in some mic preamps).
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