Planar Speaker Asylum

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RE: Apogees and ethics - comments

Posted by josh358 on February 16, 2012 at 06:55:17:
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.