What component is responsible for dynamics ?

Davide256, I find nothing that you say to be true in my experience.

Active loudspeakers.

Much as I appreciate the very best high-end audio can do, it cannot and will not ever be mistaken for a live performance, even in a world class system set up correctly in a world class space - one could tell the difference instantly.

Learsfool, context plays a huge role here. If you are at home, you know already that there is not a symphony orchestra in the room. So you won't be fooled no matter how good it sounds. But what if you are at a recording studio? In this case it is reasonable to expect live musicians playing instruments live. In such a context, a good system can fool you easily!

Imo, even that premise is relative. I have no doubt there are recordings that if they can't fool you just because you know they are, you will still conclude it sounds real. I happen to have one.

I will add that this ability is far more dependent on the recording than the gear.