This is text from what I believe are one of of Silversmith’s patents and while it is not specific to the ribbon, it relates to the thought process. @dgluke , I am not sure if your comment was directed at me, but I think I read the marketing sheet accurately and interpreted it accurately. This would imply the Fidelium could be high in resistance. This would contribute heavily to a distinctive sound signature.
https://pubchem.ncbi.nlm.nih.gov/patent/US-2020303092-A1
A method for reducing frequency dependent energy loss and phase errors from end to end as a function of the frequency of audio-range signals conducted therein including obtaining an electrical wire having a first end and an opposing second end and comprising of an electrically conductive metal with a conductivity between 0 and about 3.2* 106 (ohm-meter)−1 or between 0 and about 5.5% International Annealed Copper Standard (IACS), wherein the electrically conductive metal includes a relative magnetic permeability between 0 and 2, and transmitting audio-range signals from the first end to the second end, wherein the frequency dependent energy loss and phase from the first end to the second end is a function of a frequency of the audio-range signals transmitted therein.