| Subject: | HA earphones construction |
| Posted by: | JC (menard…@orange.fr) |
| Date: | Sun, 25 Dec 2011 |
I would like to know how the HA earphones are built, are they magnetic,
piezo....they are so tiny that I do no understand how they can transmit low
frequencies such as 250 Hz.
I did not found valuable answers with Google, has somebody some info ?