Roland Krammer from Crayon audio in depth insights into the skin effect cable phenomrna. More then worthy reading with enclosed PDF white paper...
Some time ago (a few years), a colleague came to me. Someone who experimented a lot with cables. He brought with among others a very thin network cable. This cable was sold at Farnell as a network cable for Gigabit links.
Logical structure. About everything diameter approx 1.9mm. Teflon-insulated. Braided copper shield. Line consisted of a silver-plated iron wire 0.09mm. For frequencies of 1GHz a clear case. At these frequencies the current flows anyway only in silver.
He led me up also this cable as a RCA cable. To my surprise, this iron wire sounded very good. I would not say that it was the best cable. But it sounded good. I was irritated. For high frequencies, the silver was the explanation. But why this sound at NF?
Now; from long years RF and high-speed design, I know that an impedance change is always accompanied inside the bandwidth to be transmitted with losses (information losses).
In the PDF (Skineffekt Graf 0_8.pdf and Skineffekt Graf 0_09.pdf) you can see how the conductor cross section changes over the frequency. If the wire has a diameter of 0.8mm, the iron wire grows down from 100Hz away. The same wire with the diameter of 0.09mm, the conductor cross section changes grows down from 500KHz away.
In my opinion, that is the reason.....
The Next Gen RCA plug WBT are also made with thin conductors. In addition, thick connectors contacts are never used in the RF- and/or high-speed technology, but still thin flat contacts.
In the "Benefits of the flex-cable.pdf" there is more description what does the Poynting Vector, the Skin-Effect and the Proximity Effect concerning wave resistance and signal- and energy-transmission.