I read all the posts here and it talks about the same subject as a post I started last week. I will add this to it as well.
I now have two high end sound systems now, over 100 K invested, of which 10 K in cables. In Montreal I have mostly Transparent speaker and interconnects with a Simaudio amp and recently Q concept 500 speakers. In the chalet, now our main home, I have new Raidho X3 with Devialet amp and Luna Red usb and speaker cables.
My problem here is with power cords. Here are my findings:
The Audioquest Blizzard with the Raidhos make them sound less lively than a cheaper power cord. The same setup with the Q concept worked fine ( I had them at the chalet for a month)
The Q concepts back in Montreal replace Wilsons Sophia 3 . Now the sound is too bright. No distortion, but too bright nevertheless. So I took out the DR Acoustics Red fire ( 5 K) and swapped home made Furutech heavy gauge. ( 200 $). And guess what: the balance of the speakers was back to normal. Could have more separation in instruments, but at least you can listen to the music and not the equipment.
I am not an engeneer, bus I said to myself: if the DR are more revealing, why noy try them with the Raidhos. Well, I just did and .... it works !! The Raidhos are now as good as they were in the store.
In tis swap, the impact of the power cord was as big as one qurter turn in the old treble knobs. Much bigger impact than interconnects , digital and even speaker cables.
Finally, I want to point out that I went to a lot of live concerts in my life: Pink Floyd, ELP, Police, Sade etc, as weel as many symphonies in Montreal, Paris, Vienna, Milano, Carenigie hall etc.
My criteria for any music, live or reproduced is: does it make my hair raise on my arms and the top: on my neck.
My exprience with 4 power cables fron 50 to 5000 $ made that happen in both systems.
Conclusion: experiment with power cords. If your hair stays down, do not buy.
Have fun.