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Re: Microphone advice for Parabolic please

Subject: Re: Microphone advice for Parabolic please
From: "grummyaa" grummyaa
Date: Mon Sep 17, 2012 8:06 pm ((PDT))
Yeah. I've seen a number of articles and at least one video on the DIY doll=
ar store umbrella hat reflector before. If I come across one of those silly=
 hats I will make one to try. I'm just skeptical of the audio quality of so=
mething like that. I read somewhere that I'd need a dish at least 18-19" if=
 I don't want to filter out anything below 500hz drastically. Does that sou=
nd accurate? In which case the little umbrella must cut off even higher up.

Also if it's not a true parabolic does it not risk comb filtering at all. O=
r is the advantage of a true parabolic simply just a bit more "amplificatio=
n"? Does a non parabolic potentially amplify more unevenly across the spect=

Known that the Telinga offerings are much cheaper than the other options I =
listed is indeed very helpful. I would hope to be able to get a decent size=
d plastic parabolic dish for under a hundred bucks though. Especially consi=
dering what the material to make such a dish would cost. In the end wouldn'=
t it just be a mold similar to how a plastic salad bowl would be made?

I hope I'm not coming across as too ignorant of a cheap  dick. I just don't=
 understand why it would cost $200 -$1000 for such a thing. I suppose some =
R&D was involved but in the end aren't they just moulding plastic to spec. =
Or are they using special material that normal hardened plastic cannot do?

--- In  Jim Lee <> wrote:
> Just to reinforce the "secret' allow me to reintroduce that really
> inexpensive and whimsical parabolic mic made from an umbrella hat. It
> does remarkably well considering what it is made of. Some sample
> recordings on the site:
> Jim
> On 9/17/2012 6:56 PM, Avocet wrote:
> >
> > > So I'd like to know where you all are finding your suitable
> > > parabolic reflectors? Or are you folks seriously dropping $1000 + on
> > > something like a JonyShot, Lil' Ears, or Telinga and dropping $10
> > > electret mics into them.
> >
> > I'll let you into a secret - you don't need an exact parabola. If you
> > can find a cheap dome or a used skylight, experiment with that.
> >
> > The advantage of a custom made parabolic rig is that someone else has
> > made it work and ones like the Telinga fold up and are light to carry.
> > The original parabolic mics were made from ex-military radar dishes
> > which were heavy and difficult to handle. Sound parabolas were also
> > made on a mould out of fibreglass, but that is a messy job and they
> > are also heavy and clumsy.
> >
> > I'm playing with my alternative Brinibox design which can be lighter
> > and which gives a good stereo image with about 12dB boost so you can
> > get results from cheap mics.
> >
> > See:
> >
> >
> > David
> >
> > David Brinicombe
> > North Devon, UK
> > Cogito cogito ergo cogito sum - Ambrose Bierce
> >
> >
> --
> Jim Lee --- Bamboo Turtle Studio
> Website:
> Blog:
> Rock Nest Monster:

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