Why high-end cable manufacturers don't post measurements?

speedbump6, it sounds to me like you understand the difference between the numbers and test performance performance and the search is to figure out what is not being taken into account in the calculations. From my work on cable design I have found there are some factors (if you think of it as a factor in an equation system) which influence the perceived performance, but are not commonly taught in engineering classes. 

In the case of audio, not ever one likes the same thing. So, sell customers what they want or don't bother with that particular customer at all. I often pass on particular customers completely, but I may ask them if they have experienced I particular design they might like even when it is not my design. I try to be helpful when I can, but only if I think the potential customer may appreciate it.

Racing was a hobby of mine, to old for it now.

@audio-union
Very interesting comments.  It would absolutely be a challenge, perhaps impossible, to analyze blind testing data to develop a scale to predict system performance.  However, I don't think that's what double blind testing is really about.  It is about whether you can reliably (consistently) hear a difference between two things - something that can be reported flawlessly and which many audio product claims fail.

Lostinseattle, I agree with your comments. With the addition, you need a scale to measure the skill level of people doing the testing, in this case it also helps if you do a hearing tests on the people doing the scoring, and you also need to understand what a particular person appreciates. The subject gets to be complicated in a hurry, but not unmanageable. Connecting blind test data to engineering measurements is the hard part, but in some cases it is well known. I read these blogs because occasional someone will make a comment that adds one more layer to the problem. The idea is to get your arms around as much information and ideas as possible and continue to search for more.

Audio, exactly correct. To me, this is simple logic, and so many people let their emotions or preconceptions color their ideas. They become entrenched in a position. Some will say I’m not open because I don’t agree with their more limited views on a subject, and that I don’t agree that their position must be inscribed in stone.

Regarding skin effect, I found this article from Belden:  https://www.belden.com/blog/broadcast/understanding-skin-effect-and-frequency

I would trust them far more than anything on Wiki, for authors and writers it is not considered a reliable source of information.

You can draw your own conclusions from the article.