Finally, there has been mention of blinded studies. I’m not sure why the audio magazines aren’t full of them. A panel of experts. Same room, same system, equipment not visible. Various songs played at various volumes but only one physical element changed. Experts fill out a check list of important qualities, each one on a 1-5 scale. Then you repeat the whole test 3 times. That’s how you test subjective elements. I’d say panels would need 5-10 experts. Maybe the magazines do this. I suspect most would rather not.
It's interesting also that Stereophile provides detailed measurements that you can compare for speakers, amplifiers and digital audio components.
But they produce no measurements for any interconnect/speaker cable/ AC cable/power conditioner reviews.
I suspect John Atkinson, who does their measurements and generally likes to see how things tick by looking at differences in objective measurements, knows something when he's not bothering to measure those things ;-)