The facts are, in his system, with his speakers, in his room and with his ears he is getting a certain result.
Yes, that's a fact, although the word "result" is a bit grandiose in this context.
But the way he arrived at that "result" tells us only about him. It doesn't tell us anything about the equipment he was listening to. That is also a fact.
I'm perfectly comfortable with a forum in which both these facts can be cited. Apparently, others are not.