I don't know what to tell you. I've tested dozens of pairs of headphones and some have a clearly, obviously larger soundstage than others, with the same exact inputs. Others have a more "inside" feel. I think we must simply be talking about different things, because what I'm describing is a commonly cited property in headphone reviews and discussions.
They don't, not on its size. I'm not sure what mechanism by which you think they would?
> But Apple is far from the first to do this kind of precision stereo manipulation.
Certainly not -- I never suggested they were.