Check this out first:
https://www.passlabs.com/technical_article/speaker-cables-science-or-snake-oil/
And then look at this:
https://silversonic.com/products/speaker-cables/t-14/
https://www.passlabs.com/technical_article/speaker-cables-science-or-snake-oil/
And then look at this:
https://silversonic.com/products/speaker-cables/t-14/