What component is responsible for dynamics ?

Charles, could you please explain the difference between 'realistic' and 'Hi-Fi' sound? I've seen this comparison before but no explanation.

I don't think the human ear judges loudness in audio. Certainly we can sense loudness outside our listening room and there it isn't distortion.

Tbg, sorry to be a buzz kill, but what you think above isn't really the way it is.

*Of course* our ear/brain system 'judges loudness in audio'.

And of course, we detect differences in sound level all the time :) All I was pointing to is part of the mechanism of how our ears do it (detect the odd orders in a sound) and the fact that there is a correlation to audio.

Csontos, if I may, HiFi is good but with electronics artifacts that let you know its a stereo. 'Realistic' is where the system sounds so real that voices are scary, because you think someone is there when its really just the stereo playing.

Csontos,
Ralph answered your question the same as I have offered before in other threads.
Hifi=the ever present awareness that I'm listening to a stereo system. There's nothing that leads me to believe that the sound is from living people playing instruments, increasing the volume doesn't change this perception(it just becomes louder hifi). In other words, it sounds canned and simply re manufactured.
Realistic=A natural/organic awareness that live musicians are present and this is quite believable and one is able to convincingly established and maintain a emotional connection(thoroughly engaged and drawn into the musical performance). The sense of music from stereo system is much diminished. As Ralph said, it seems other people are in your room, it's very tactile and provokes startle reactions.
Regards,

Oh. I thought Hi-Fi was the highest rating. Thank you.

Hi Csontos,
You asked for my definition and I gave it.You certainty don't have to agree and may have your own interpretation which is fine.I just expressed how I categorize components based on what I hear and the resulting effect and reaction they provoke.
Regards,