I used Cardas Neutral Reference (6’ length) for a long time, then had to change to longer cables (18’) as I was moving stuff around. I was happy with the Cardas, but it’s no longer available; if it were, I would have had to pay silly-bugger money for it. In this Covid environment I could not audition anything.
I read lots of reviews of cheaper stuff, as well as listened to what Twitch/Dave has always promoted, ie Signal Cable. I bought their Ultra cable. This is seriously thick, stiff 10ga cable that looks like it has two conductors spaced apart.
I’m glad I listened to our wise old man. The cable does sound a bit better than the Cardas, especially in the bass region. I expect that it will get better as it breaks in more.