I would love to do a blind sound test and see people fail this test over and over ... or perhaps pass and actually notice different cables ... and I mean a "legit" real factual test would be amazing.
I have Focal Chorus 836 (that I need to sell) that were powered by a Denon 4311 ... when I changed to MC152 those speakers became alive. The copper 12 gauge wire was the same, the speaker seemed like a different speaker instantly. I do believe there is places to put money, but cables are really at the end of the list of many or most other improvements.