Any of the fidelio S2 owners out there, how well do they isolate - being semi open-backed? would they be useable say in a train/subway or out on a bustling city street?
I did use it outdoors and on transport a couple of times. Still useable thou I have to turn up the volume a little to drown out the outside noise and it doesn't seems to leak sound too much. But it definitely sound great in a quieter environment.