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Re: Returned e-mail warnings

Subject: Re: Returned e-mail warnings
From: Walter Knapp <>
Date: Thu, 05 Aug 2004 12:41:56 -0400
From: "Jim Morgan" <>

> Martyn and others - 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


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.



>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 
> Thanks, 
> Daniel De Granville
> Pantanal, Brazil
> [Non-text portions of this message have been removed]


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