Don't know if it has been posted here, but I found it interesting.
Head-Fi's Best Sellers
The headphones JVC is offering have nothing to do with the news tipo posted. (Btw, iirc this was already posted a few months ago..) JVC's headphones use normal dynamic drivers. All they're saying is that they use a different material (probably labeled by the marketing department as "carbon nanotubes"). The S500 have a difficult frequency response...
Carbon nanotube drivers (as in the news article) do not have any moving parts and produce sound through oscillating temperature changes.
Edited by xnor - 10/1/13 at 3:16am
My bad. What with the attention to the JVCs and some mentions of wow-burn-in-must-be-different-on-these, I assumed they actually had to have a non-dynamic driver. Guess what that made out of u (and especially me).
So as for producing sound waves with temperature control... as I figured, the article says that the efficiency is low. They don't produce much sound pressure for the input electric power. I wonder if the linearity and properties change significantly with the ambient temperature.
Indeed, we don't know how low the efficiency is, but in-ear drivers with lower than normal (BA, dynamic drivers) efficiency could still be quite usable. Just have to turn up the volume a bit more like with on/over ear headphones.