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Chris Hornbeck wrote:
On Tue, 11 May 2004 05:59:08 +0000 (UTC), (Monte P McGuire) wrote: Try 1200 ohms to start, although a nonlinear load (i.e. one that depends upon frequency) might prove to be more desireable. A simple way to manage that is to get 1200 ohms reflected to the primary of a transformer. IMHO, this'd probaly sound most 'right' with a 57, as it'd nominally be 1200 ohms in the midband and considerably less out of band. Could you comment on any possible reasons for this often-expressed loading? And is there any relation to the 57/58's internal "transformer"? Ignore the transformer. Let's take a mike like the 635A, which is just a coil of wire on a diaphragm going to a connector. Press the diaphragm with your finger, and you'll feel that it takes very little pressure to move. Now, short pins 2 and 3 on the connector, and press on it, and you'll feel that it takes a lot more pressure to move it, because you are moving a shorted coil through a magnetic field. You can get the same experience with a speaker driver, or by turning a permanent magnet electric motor. As the loading increases, the diaphragm gets stiffer because the mechanical resistance increases along with it. And this makes the resonant frequency rise, and so the mike frequency response changes. The transformer in the signal path makes things harder to model but the general effect is the same. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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