Speaker cables can make or break a system. My main system, i have Dynaudio Speakers and Sugden Amps. I found that WireWorld is a great pairing for that equipment. My Second system in the basement, I am running Another Sugden amp, with PMC Twenty5.22i speakers. I have Madison Audiolab Cables, they are a very neutral cable, sound perfect. I tried a $3000 pair of Verterre Speaker cables in the basement, and they sounded like someone covered my speaker with blankets.
Only Demo cables you don't have to buy if you are fortunate.