No. There is little point in me testing them. Nothing in electronic theory can possible account for there being a difference in the sound. I believe what is being reported here is essentially confirmation bias, and I don’t need to spend my time being a part of it.
If and when someone conducts legitimate double blind tests with a qualified panel of listeners and can state that there is a difference, then I’ll become interested. I’ll be surprised, but I’ll be interested.
So your entire argument is based simply on a *lack* of evidence, while also being unwilling to test it for yourself in any way?
Is that not also a form of confirmation bias?
I would think testing should be simpler than even a double-blind test by measuring resistance across a length of cable, split it in half and testing the resistance with different types of connections.
I imagine you could also test using a tone generator & oscilloscope to look for any differences & possible interference that may, or may not arise across the different varieties of connectors at those different frequencies.
I don't have any such equipment, so I personally cannot test these ideas myself. However I'm not unwilling to consider I may be right or wrong regardless. My default position is to defer to those with more experience than myself, until further, more concrete, evidence arrives.
That said, you have to be willing to at least consider all the options available to you, and your own ability to be right or wrong. Even if no such evidence yet exists, either for or against your position.
You have to pose the right questions to the right people that can test such a theory and come to your own conclusions based om those results.