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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: 02/16/12Follow Ups:
What I was talking about was dynamics.
All You say is right when talking about output.
But dynamics are all about having a non restriction or as little as possible. And here a ribbon is unbeatable... except for maybe plasma. hehe
The restriction for a membrane will be exponential and therefore the dynamics will decrease exponentially.
Single ended or double pole piece are another discussion as it is mainly a linearity and efficiency one as such. But both will suffer from restriction from the suspension.
The one who succeeded was the one who didn't know it was impossible.
Why would it be nonlinear, though? I'd expect the deflection to be pretty linear until you get near the elastic limit. Which you don't want to do because you'll stretch or break the diaphragm.
What I mean to emphasize is that suspension equals compression and thus less dynamics.
The one who succeeded was the one who didn't know it was impossible.
Is it? I always assumed it was pretty close to Hooke's Law, that is, linear. In two dimensions, of course, with more compliance laterally than vertically.
"Is it? I always assumed it was pretty close to Hooke's Law, that is, linear. In two dimensions, of course, with more compliance laterally than vertically. "Not really if You look at the function of a suspended membrane witch is not a spring.
You could though try to integrate Hooke's law into the calculation of air volume that is very non linear for a suspended membrane.You probably understand me now? :)
The one who succeeded was the one who didn't know it was impossible.
Edits: 02/16/12
Sure. The next question, then, is which distortion mechanism predominates at high excursions -- the nonlinear displacement, or the nonlinear magnetic field?
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