Thank you all so much for your responses. Food for thought for sure.
I can add that I do have dedicated lines with PS Audio and Audioquest wall outlets.
In my quest for the new main system, I have listened carefully to over 500,000 $ of high end speakers in the last year, not counting all those at the Montreal Audio show. A long but immensly satisfying journey. Thank you for the Dealers in Montreal , Codell Audio, Art et Son and Éric at Filtronique and in Paris, Devialet main store and Présence audio. Speakers were Magicos, Wilsons, Paradigm Persona, Audiovector, Rockport, Focal, Sonus faber, Qln and Raidho, just to name the finalists.
They were all great, but different. I could summarize my findings in another post.
But going back to cables, power in particular, I am quite baffled by the big sonic difference I hear between the Audioquest blizzard, which I would describe as dark, TDR Red Fire, too much detail and brightness for the Q Concepts and Furutech, with good balance but maybe less differentiantion of instruments in orchestral music.
I know this is all scientifically unexplainable, but I still need to make a choice.
My wife has better hearing than me, and although she has no interest in all this, she and her daughter immediately notice when I made a change and can describe it in their own terms, which are correct.
I listen to hours of music every day, often at pretty high volumes. I discover new music with Apple Music and Qobuz reviews. I then buy the hires tracks from Qobuz and store them in the Aurender. Contemporary recordings by ECM, DG, Erased Tapes etc are incredibly better than last century ones. But in the end, its the music that counts.
Thank you all again for sharing your thoughts with me.