In Reply to: RE: Apogees and ethics - comments posted by JLindborg on February 15, 2012 at 08:20:46:
On the other hand, the forces on an electrostatic are essentially limited by the breakdown voltage of air. So there's an upper limit on the force that can be applied to the diaphragm at a given stator spacing, which I think is about 1/10 that of a planar magnetic. Whereas in practice, the low frequency excursion of large planar magnetics seems to be limited by the position of the magnet assembly, which is determined by efficiency and magnet strength. They'll play until they slap the pole piece. So as far as I know, for a large planar, the limitation on LF output is imposed essentially by the cost of the magnets, and of a mechanical assembly of sufficient strength to accommodate them. For a smaller planar like the Neo's thermal damage could also be an issue, and also maybe distortion at large Xmax's caused by the non-uniform field. As far as I know, the compliance of these plastic films is a constant, so I'm not sure where dynamic compression would occur, unless it's a subjective consequence of rising non-linear distortion? And I wouldn't expect most of these concerns to apply at higher frequencies, where excursion is low.
Edits: 02/16/12
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Apogees and ethics - comments - josh358 06:55:17 02/16/12 (6)
- RE: Apogees and ethics - comments - JLindborg 09:23:02 02/16/12 (5)
- RE: Apogees and ethics - comments - josh358 10:41:28 02/16/12 (4)
- RE: Apogees and ethics - comments - JLindborg 13:23:02 02/16/12 (3)
- RE: Apogees and ethics - comments - josh358 17:14:20 02/16/12 (2)
- RE: Apogees and ethics - comments - JLindborg 21:33:33 02/16/12 (1)
- RE: Apogees and ethics - comments - josh358 16:57:45 02/19/12 (0)