Sorry, did not want to subject you to any Inquisition, let alone Spanish. :))
But I think that you yourself have asked the key question -- why so many manufacturers don't provide those numbers?
I use 12 AWG speaker cables that I bought on Amazon for~$15 and the power cables that came with my amplifier. If I paid more, I would feel really stupid and exploited. Now, I have a Ms in physics and know a bit or two about electrical circuits, conductivity, electrodynamics etc., so bold claims about "the sound of cables" don't impress me too much.
But I think that you yourself have asked the key question -- why so many manufacturers don't provide those numbers?
I use 12 AWG speaker cables that I bought on Amazon for~$15 and the power cables that came with my amplifier. If I paid more, I would feel really stupid and exploited. Now, I have a Ms in physics and know a bit or two about electrical circuits, conductivity, electrodynamics etc., so bold claims about "the sound of cables" don't impress me too much.