I have only used Canare L-4ES6 for interconnects, single ended and balanced, for at least 25 years now and even in my high end car audio comp builds from back then. I will have to give the 4S11 or 4S11G a try in our full time RV system as soon as I start building speakers for it and I will likely try the Beldon 5T00UP. Once I am satisfied with the wire to use I will silver solder them directly to the speakers or crossover components of the various builds I test, OB, sealed, ported, etc....
In my personal opinion, based on success in audio comps and 20 years as a tech on very complex electronics, I believe in good cabling at affordable prices is all one really needs. Anything beyond that the price is exponential for little perceived gain but more likely differences, not improvements, to help different pieces of gear suite the sound of the owners preferences as we all are a bit different in how we perceive things.
Rick