@Perki - totally respect your point and fair question. But I respectfully disagree with you - some do claim HUGE differences. And if one part can't be determined to be better, than how would the sum of those parts be better? (0 + 0 = 0.) If they can't be determined on their own, than how can a combination of them make it better? (I hope I was able to articulate that okay... If not, my apologies in advance.)
And, I'm open to it. But, I have been bashed for my own experience which, is no change in my system. It's something wrong with my ears, or my 30k system, or my room - or my inexperience. I'm absolutely open to an A/B test. (And I have done them.... often times thinking I heard an initial improvement but, when blind tested, I can't tell.)