I have to say that some of the responses by certain posters, including the OP, have been very disappointing.
@prof is a serious audiophile who has related, professional qualifications, is an independent thinker, and a very helpful contributor to a number of audio forums. His contributions are almost invariably substantial, respectful, and grounded in facts. His impressions of certain speakers are as eloquent and useful as any that I have come across from professional reviewers.
It’s a mystery to me why anyone would lash out at him, essentially because he refuses to budge from the reasonable position that if people hear differences between components when there is no scientific explanation for such differences, the claims can only be fully compelling through blind testing.
Note that I am much more of a "subjectivist" than "objectivist", and strongly believe that I have heard differences between both speaker and powers cables. I currently use some fairly expensive cables, albeit purchased used. I have not engaged in blind testing because of how complicated and expensive it would be, but completely agree that @prof would be correct about my claims being suspect. I can’t deny that I am vulnerable to biases, nor can I guarantee that I would pass a blind test.
I also don’t get the vitriol aimed at @amir_asr. I don’t spend much time on his site, but to dismiss his qualifications with the wave of a hand is ludicrous. He has a far better foundation on which to perform the kind of tests that he does than the vast majority of audiophiles.
At some point I will write a post about some of my recent experiences with power cables, which were certainly compelling to me, even in the absence of blind testing!