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Re: Pearl MS8 (was Digest Number 2102

Subject: Re: Pearl MS8 (was Digest Number 2102
From: "Rich Peet" <>
Date: Fri, 28 Apr 2006 15:01:52 -0000
I do not believe a single diaphram MS mic will work as a stereo
parabolic mic.

Think of the focal point in a parabolic being a pressure globe shaped
area. The globe represents a specific focal length at a specific
direction.  The outer portions of the globe contain low freqs and the
inner portions all of the amplified sound.  You are either receiving
this pressure globe or you are not. Or stated differently you are
either getting the gain or you are not.  The mics pickup pattern does
not matter other than to eliminate the "direct sound" from the
"reflected sound" which will have phase problems.

The telinga runs a thin barrier to get it's stereo image.  This means
that each mic on each side of the barrier can view only half a dish.

I run separated mics which means that each mic is seeing the whole
dish but seeing a different pressure globe for a different viewing
direction both at a defined focal distance.  The disadvantage of this
approach is that the image for off axis sounds is direction flipped
from the amplified images.

With both approaches when you push the mic away from the dish the
focal distance becomes closer.  On very close subjects you can convert
from using the dish as an amplifier to being a noise shield like when
I was recording a frog next to a highway at about 3'.

Rich

--- In  Rob Danielson <> wrote:
>
> At 11:54 AM +0100 4/27/06, Julian Baldwin wrote:
> >
> >
> >Have you, I wonder, tried one-piece MS microphones such as the
Pearl MS8? It
> >always struck me that it would be an interesting mic to use for
stereo with
> >a parabolic reflector. It is also a great deal easier to carry
around than a
> >couple of studio condensers.
> >
> >Maybe other list members who have tried this mic would care to
voice their
> >opinions.
>
> Hi Julian--







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