@cakyol
Do you believe that power cords make a difference? If your answer is yes then apply the same logic about the manufacturers and see how unconvincing you sound. If your answer is no, then...
By the way, science progresses only when people are willing to challenge the established knowledge of the era, whether it is flat earth or gravity. You are no smarter than anybody else, you are just more stubborn. You think your engineering theories are immutable and that we should suspend reality to fit them. It doesn’t work that way. I didn’t think a fuse could change the sound of my amp either, but yet it did. So no amount of theories can change that. It is what it is. Let’s agree to disagree if you cannot hear it in your system.