What is the best dielectric?


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
cdc
No dielectric is the best dielectric.

That said, air would be my weapon of choice. 
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.

All the best,
Nonoise
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