2 channel vs headphones

My headphone AKG K340 give me a sound which comes to my ears like if i was listening to speakers out of the head... No fatigue... And i listen at relatively low sound level... 

Then the problem  is very bad headphone fatiguing one like the Grado i never heard again after the first and last time i listened to them...It was not a high level model... Like the  low cost Stax model  i disliked  for his artificial sound...

Then the danger is not headphone , it is bad design paired with high level  sound pressure and some unbalanced set of frequencies..

Headphone well chosen, optimized, at low level  for listening,for sure pose no problem...

Public concert of rock, pop etc  and speakers designed for this kind of music at high level is the problem ...

Pop music at high level in the ears for sure = deafness...

Beethoven quartet through headphone will not make me deaf .... 

I prefer speakers by the way to headphone.... But now in my  local condition i enjoyed my headphone too ...

Well yes when you have these.full ear covering headphones on music is loud.I Used to feel trapped in a cave ,either my ears being blown out.Opennaircones would be better, put i don't want or need any of them.

@limomangus - yes, they are loud and deafening if you turn the volume loud, just like speakers. Again, if you get a headphone amp with a volume control, you do not need to have that problem. Enjoy your Sunday!