I'm almost afraid to post this, but here goes...
I just started (okay, restarted) this hobby after a 25 year hiatus. I just upgraded my stock power cable (looks just like a computer power cable) to a Shunyata Venom 3.
I can hear a big difference. My speakers sound better to me. I have not compared them to a $3000.00 cable. I don't need to do that. For the time being, I am quite smitten by this cable's contribution to my enjoyment. Perhaps, as I progress down this road of improvements, I will try another, better cable, but not now.
I'm using simple 14 gauge speaker wire. I am told such and such speaker cable will have a huge impact. Since switching out my power cable had a noticeable effect, I am now willing to entertain the idea of better speaker cables.
Just my humble thoughts.
Regards...