A vacuum is the best dielectric? Since this is not pratical would air be the next best dielectric or would there be a better sounding dielectric like cotton? Would there be a difference for speaker wire or interconnects? Thanks
Some reasons to admire a design such as Anti Cables are (1) no dielectric, (2) no jacket, (3) no shielding, (4) high purity copper and last but not least, (5) directional ARROWS.
Like @kijanki has said, an ovesized Teflon jacket is among the best. My Tempo Electric speaker cables are one piece, solid core 14 gauge silver with a 9 gauge Teflon sleeve. Air becomes the primary dielectric and it's the best I've heard in my system.
I would say what is the best jacket for WHAT PURPOSE? Teflon is good for clarity, but not nearly as good for bass as some other types in insulation.
I refer to Kimber using a non Teflon insulation in products touted as have better bass response. And in my experience, yes they do. Kimber Hero, KS1116/1016 and Speaker cable VS.
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