It happens more and more that I google something I would like to know, and find a useful description which was written by… myself.
Cheers and happy(?) information overload,
PS Just this weekend I got (yet another) recommendation from my brother for the Beyerdynamic DT770 80 Ohm. These are his go-to headphones; he is much into virtual synths and building complete songs in his DAWs. He is not a piano player though.
Indeed, the 250 Ohm version isn't the sweet spot, and only useful with powerful dedicated headphone amplifiers. If any headphone output isn't up to the 250 Ohm task, they just won't sound any good.