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The DC's mentioned above (page 1) are roughly $200. They are ok, but not great for anything over an hour or two, as pilot's we get used to headsets, but passengers do seem to struggle a bit.
I've also used some StarComs that were $120 each, but all we got was complaints about crushed heads from passengers (after bending them out it was complaints about loose fits - can't win).
Have always wondered how a nice set of normal, off the shelf headphones would work. Maybe a set of Sony or Phillips noise cancelling headphones from JB or Harvey Norman.
Has anyone had any experience with them in a 210 or Airvan? Maybe a 402?
Would be great to get some insight.
LWN