Re: [Harp-L] controlled magnetic microphone

[Tim Dougherty <timd@xxxxxxx>]

Good post, Jimmy!  I've wondered this very thing.  Perhaps this would make 
the CRs/CMs the "original" dynamics, and thus a little more crude in design 
- making them great harp mic elements!  I believe the first CR was 
introduced in 1949.  I don't know of a dynamic Shure mic from that same period.

Tim Dougherty
www.HarpMicGaskets.com




At 02:21 PM 2/2/2005, you wrote:
> I was confused about the difference between a dynamic mic and a controlled
> magnetic mic. Here's the answer I got from Shure.
>
> Response (Michael Pettersen) - 02/02/2005 01:53 PM
> A controlled magnetic element is a variation of a dynamic element.
>
> In the controlled magnetic (also called controlled reluctance) element:
> 1) the magnet is stationary,
> 2) the wire coil is stationary,
> 3) the metal diaphragm moves a ferrous rod that disturbs the magnetic field,
> 4) thus causing an output signal in the wire coil.
>
> The controlled magnetic element was developed during World War II.  It was a
> very rugged design that could stand up to military use.   Shure discontinued
> the last controlled magnetic microphone in the early 1980's.
>
> Therefore, all controlled magnetic mics are dynamic mics, not all dynamic mics
> are controlled magnetic.
>
> Rainbow Jimmy
> http://www.spaceanimals.com
> http://www.soundclick.com/theelectricstarlightspaceanimals.htm
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