Try as I might...
...to find the other post...NG, so sorry if this is repetitive...
FYI, it isn't the quality of the copper that allows for data transmission, it's the wire configuration, as in TPI or Twists Per Inch that aids in cohesive signaling...Unfortunately the more TPI, the more capacitance in the wire and in some cases that can be problematic with some amplifier/speaker combos...If you care to do some DIY, you'll probably be better off doing some investigation into existing recipes than going it alone...
Sorry I don't have any links to provide...I'm not a big believer in the whole mythology, I subscribe to the wire is wire school of thought...
jimHJJ(...as of yet, haven't seen anything to dispel that notion...)