it is clear to me not by scientific dogmatic faith or by proven scientific controlled experiments, not even by the cables marketters, but by simple experiment anybody can replicate that some minerals near the end of any connectors affect the sound quality perception ...
i even designed my own protective and filtering devices ....Homemade.... I proposed a simple experiment above and nobody dare to try it by blind faith or deaf indifference ... 😊
Since the many years i came in audio threads i read discussion without ends where all kind of scientists, real one or pseudo one with all variation of experiences , technicians , cables designers , amateurs of cables etc war against one another...
i am not qualified at all to separate the one who knows from those who dont and all in between in electro- magnetism facts ...
But being a grown up i devised the above experiment with shungite and quartz , after few years of others experiments to design my own "tweaks" homemade ...
it taught me that there is something about the audible effects of some minerals near any piece of gear cables or not ...
i even described the effect...
i can even put science litterature article confirming my above statement about sound qualities associated with shungite and quartz , their differences etc ...
it is better to experiment than to quarrel about the greatest electro-magnetic "balls"...
i will lost the contest anyway being a "poet" and a philosopher not a physicist ... 😊
«I always see Poynting vectors in my shower»--Groucho Marx🤓