12 gauge Duelund Tinned - copper in cotton, or Goertz, both were designed for audio by real engineers. You can use Western Electric, the original, it's what I am listening to now, but I am told Duelund is better, all my ICs are Duelund. There are now Western Electric fakes, so if you buy W.E. I recommend buying from;
https://www.ebay.com/sch/tajacobs/m.html?_nkw=&_armrs=1&_ipg=&_from=
If using Goertz USE THE ZOBELS! Goertz like the old and much vaunted Polk cable, is almost purely capacitive and can send amplifiers into oscillation in inaudible frequencies, which can destroy you amp. I have used Goertz for years, WITH ZOBELS! I haven't yet done an A/B, but both sound like they don't exist IME. Other cables do seem to impact the sound, so if you are trying to cover for other issues, keep looking.
https://www.ebay.com/sch/tajacobs/m.html?_nkw=&_armrs=1&_ipg=&_from=
If using Goertz USE THE ZOBELS! Goertz like the old and much vaunted Polk cable, is almost purely capacitive and can send amplifiers into oscillation in inaudible frequencies, which can destroy you amp. I have used Goertz for years, WITH ZOBELS! I haven't yet done an A/B, but both sound like they don't exist IME. Other cables do seem to impact the sound, so if you are trying to cover for other issues, keep looking.