Cables ... no longer opinion


PS Audio has already did the research. The answers are available forevermore.
The testing is sound, and not flawed. Their test results find exactly the same results my cable manufacturer found and preached. Josh from Downsize Audio Cables also found two strips of foils, stacked on top of each other and secured together made the best sounding speaker cables. I've tried all kinds of hyper expensive cables to dethrone the Downsize Audio foils ... NOTHING comes close at any price.
      Downsize used a genuine teflon backed adhesive tape, double sided too, and custom rolled, extra thin foil of 6N purity. BUT he told me a person can get 90% of the same sound quality, using off the shelf inductor foils and standard thin packing tape. Try it and save tens of thousands of dollars.
https://www.psaudio.com/copper/article/the-sound-of-speaker-cables-an-analysis/
flaxxer
No prob, millercarbon. I'm in California. In the 90s, I sold high end audio for years. Suits and ties.
We stocked Townshend products after a Rep tried to sell us on the newest snake oil ... until he left a seismic sink for us to play with. I threw it under the LP12 I kept in the store's front listening room. ALL the employees, and the owner stopped dead in their tracks when coming through the room. "What did you do to the big Vandetsteen system to make it sound so much better"? Was the question everyone inevitably asked, lol. We ordered a dozen of them for the store, and a dozen for inventory! So I've owned Max's products since 95 ish.

As far as my sloppy writing style ... did I mention I used to listen to music really loudly? LOL
Probably scrambled my memory of writing classes. Yes, we had those 45 years ago, lol.
My lord .... I just did a Google search on foil speaker cables. At one time, only Magnan made them while Downsize did. Now there are a slew of foil cables, including DIY websites. 
Word MUST have got out. I read a few articles and reviews .... almost all of the foil cables which are stacked tightly together, positive and negative runs that is, get rave reviews. Claims are more coherence, and clarity. With astonishing Dynamics, and almost perfect highs. This is the general sound advantages of foil cables. Beware though, all of them seem to use a heavy protective outer jacket. I remember Josh saying he ended up getting his tape made special, to keep it thinner than a human hair. This was one of the things that made downside cables better than the competitors. Josh believes in almost zero insulation, and came up with Brilliant Solutions for this build technique. He also used one of two connectors only. Zplug type hollow bananas, and Wireworld silver spades. He prefers Hollow bananas for everything. Claiming their low mass blows away WBT, Eichmann, and other low mass offerings in the industry. When I finally went with all downsize cables oh, I got rid of my nordost Valhalla cables throughout my whole system. I made a ton of money selling those used!
Ed Shilling of Hornshoppe Horns used copper foil ribbon speaker cables that he made for himself. Back when I had his speaker, I noticed them on a photo on his site and asked about them. He said they were better than any cable he tried and were cheap and easy to make. I never did take him up on his offer and maybe should have. That was about 25 years ago. (maybe even 30)

All the best,
Nonoise