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Re: equivalent bi-directional mic?

Subject: Re: equivalent bi-directional mic?
From: Klas Strandberg <>
Date: Wed, 01 Jun 2005 20:57:32 +0200
EM21 is a cardioid capsule, sister to the omni EM23, the same cardioid as 
in Telinga Twin Science mic.
Facing back-to-back is often best when the sound is distant. When the sound 
is close, like a voice or a violin, it is sometimes better to keep the 
membranes as close to one another as possible.

Just came to think about it - the microphone body of Twin Science will be a 
good(?) eight, if one uses two EM21 instead of 1 EM21 and 1 EM23!  It won't 
be an excellent eight, unless one is just very lucky. Good eights are very 
difficult to design, as each capsule has to have it's backside membrane 
dampening adjusted. Among other things. But for experimental, why not? The 
noise is only about 14 dbA and I think I could supply it "raw" with two 
cables hanging out for some 400 dollars. Just for fun.


  At 19:40 2005-06-01, you wrote:
>Klas Strandberg wrote:
> >Run 2* EM21PIP
>What's that? A Telinga cardioid mic?
> >and connect each mic to pin 2 and 3, respectively, of a
> >balanced input.
>Of course! Why didn't I think of that! Phase inversion is built into
>a balanced input.
> >Sometimes it is better to have the capsules side by side.
>Two cardioids side by side to create a bidirectional pattern? Tell me
>more, seems like they should be back-to-back. I'm looking for a
>low-noise bidirectional mic (or array) to mount on an MKH816 for M/S.
>-Dan Dugan
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links

Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01


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