[tipo33]

Don't know if it has been posted here, but I found it interesting.
http://science.slashdot.org/story/13/09/30/2213245/new-headphones-generate-sound-with-carbon-nanotubes

 

[mikeaj]

Doesn't JVC have a line of products based on carbon nanotubes already? HA-FXD60/70/80 etc.?

 

[PurpleAngel]

JVC HA-S500 & HA-S400

 

[TrollDragon]

JVC HA-S500's are just incredible, believe the hype and check out the Appreciation Thread.

CNT FTW!
\m/ \m/

 

[tipo33]

Didn't know that.  I will have to check them out.

 

[xnor]

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.
 

 
vs.
 

 

[TrollDragon]

Oops My Bad...
 
Just got caught up the the JVC hype. 

 

[mikeaj]

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.

 

[xnor]

 
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.

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.