Since the goal of listening to music on the Hi-Fi is enjoyment, the only valid proof of anything to do with that experience lies in listening. Here at AudioStream, we listen to the products we review and report on what we hear. The value in this equation is simple; you are getting an honest and careful appraisal of how a given component, cable, app, or tweak affects our enjoyment of music. In my opinion, the more experience we have with this process and you have reading what we write, the more value you'll find in our reviews. Simple stuff really and not at all unique in the world of audio reviewing. So I have to wonder why some people expect/demand something more?
"Readers Look To You Guys for Proof!" was part of a recent comment here on AS. Really? That's like me expecting to see your High School GPA in your comments. Not only is this wrong-headed, it is obviously looking for proof in all the wrong places. It's also very common for these same proof seekers to demand measurements which I've repeatedly said is something we'd like to offer but cannot at present provide due to budgetary contraints. Besides, measurements obviously have no direct correlation to enjoyment. Simple stuff really but some people just can't take "not at present" for an answer.
If you want proof you'll have to look elsewhere. If you want to learn about the enjoyment of listening to music on the Hi-Fi and ideally how to increase that enjoyment, you've come to the right place.