From: "Jim Morgan" <>
>
> Martyn and others - siaab2ab.compuserve.com is not listed as a member. You
> can double check me, perhaps I over looked him/her. If you can find this
> address in our member listing
Jim-
That's not the address I've been getting bounced. It starts with a c,
and is a company server, but not compuserve. Unfortunately I've been too
effective at throwing the messages away. I'll get you the address next
time I get a bounced one. Been meaning to send you the address.
Walt
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>From Tue Mar 8 18:27:55 2005
Message: 4
Date: Thu, 05 Aug 2004 15:40:52 -0000
From: "Rich Peet" <>
Subject: Re: Placing Mics in a Parabola
three types of off axis to consider.
1. off axis in from focus point.
to be avoided in all uses because you will never find gain from the
dish of any real value. The dish becomes only a shield and not an
ideal shield for sound use.
2. off axis out from focus point.
changes focus point to favor closer targets. The closer the target
the farther the focus point is moved.
3. off axis to the side.
moves target position to point on the opposite side. The farther out
of ideal causes a loss in ideal gain. Target by ear to determine how
far off you went. Technique is used for some stereo applications.
Rich Peet
--- In "Daniel De Granville"
<> wrote:
> Hi there folks,
>
> I am still experimenting with the umbrella that I use as a
parabolic reflector. My question is, considering the Sennheiser ME62
(omni) mic, is there any problem concerning how far off-axis the mic
be placed, in relation to the umbrella's central shaft? I am asking
this because I've been trying to use a test tube clamp in order to
hold the mics in place (micS because I'm also doing experiments with
the Sony ECM-MS957 stereo mic), but this clamp is not able to make
the mic point precisely to the center of the "pseudo-parabola".
>
> At first, one would think that - since we're talking of an omni
mic - this off-axis placement wouldn't be a relevant issue. Am I
right?
>
> Thanks,
>
> Daniel De Granville
> Pantanal, Brazil
>
> [Non-text portions of this message have been removed]
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