Just an observation. Interesting conversation. I started reading it from the beginning but then the same ole pattern was obvious. There are those who have spent the money, did some serious listening, and have drawn some conclusions on if this or that makes a difference in SQ in ones system. Usually these are people who can point to something specific when making such a claim, or explain their observation e.g. better highs, or better bass, or better imaging, etc.. On the other hand there are those who criticize, but only have that criticism with no meat
Those that claim they can hear a difference in power cables provide no more meat than the skeptics. If there is a difference in sound, there must be a difference in the signal going to the speakers. I have never seen any proof of this.