Danny actually uses those metrics to design his speakers and even goes further into the unknown--or rather unconfirmed or not researched and published.
Not unconfirmed or un-researched. The complete opposite.
Let's take a simple capacitor.
Do you think these companies just wind these things up and charge what the market will bare in accordance to their marketing?
I am what you'd think of as in industry insider. I get privy to some interesting manufacturing insights.
I can tell you that there are cap manufactures that will make many variations of the same cap and then listen to it in various applications to see what the differences are. Variations can include the thickness of the conductive material, how it is sprayed on or rolled, tightness of the winding, thickness of the dielectric material, length of the cap verses the diameter, how the end leads are terminated, termination material, wire type, coatings, type of dielectric material, type of film, etc.
And I have cap manufacturers send me samples all the time for my feedback.
I had one cap manufacturer send me three samples of the same cap and the only difference was the coating. One had a poly coating and was completely dipped and sealed. One had a poly coating just as a wrapper, but the ends were open, and one was completely open and was just wrapped in what looked like tissue paper.
Each one of them sounded different.