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!