There are quite a few variations of this kind of design around actually. I =
think I remember that there used to be a commercially manufactured one some=
time ago that would have been patented. I'll dig through the archives & se=
e if I can find a reference to it.
--- In "Mike Rooke" <> wrote:
>
> Looks like a standard tripple boundary doubled / corner reflector aka the=
pyramid:) - known art.
>
> "In early 1979, during one of the Syn-Aud-Con seminars, Farrell Becker su=
ggested using more than
> one boundary for PZMs. So we taped three pieces of base-plate together wi=
th gaffer's tape, and
> loosely mounted a PZM cantilever and capsule in the corner (Figure 1)"
>
> http://www.crownaudio.com/pdf/mics/memo22yr.pdf
>
> Nice to see the duck tape, have you tried various boundary materials such=
as fleece in the middle or sides? - Corrugated plastic is also nice and ea=
sy to work with but due to it being so light it may cause some additional n=
oise from the plastic.
>
> Theres many things to try with a setup like this, plastic hole material (=
plastic canvas) in the top to boost high frequencies giving more of an "up"=
cue. etc. - acoustic lenses all possible.
>
> I'll also mail off list.
> BR
> Mike.
>
>
> --- In "Avocet" <brini@> wrote:
> >
> > Was Re: [Nature Recordists] Re: extreme amplification
> >
> > >12 dB is rather a lot is the amplification wideband or a specific
> > >region?
> >
> > Wideband at "bird" frequencies. It still gives a stereo image at voice
> > frequencies.
> >
> > A positive reaction! I've mentioned my Brinibox design several times
> > in the past and published the test recordings.
> >
> > I've now written up the Brinibox in draft form:
> > http://www.briniblog.com/record/snrbrinibox.htm
> >
> > I don't want anyone to patent the idea, if indeed it can be patented,
> > but would like to keep the Brinibox design in the public domain. I see
> > it as a good entry level project for newbies and it could develop to
> > be a serious rig.
> >
> > The mics I used are similar to:
> > http://www.radioshack.com/product/index.jsp?productId=3D2102927
> >
> > I've also included an account of the "barrier effect" and why I can
> > measure a 12dB lift with the Brinibox.
> >
> > All comments are welcome.
> >
> > David
> >
> > David Brinicombe
> > North Devon, UK
> > Cogito cogito ergo cogito sum - Ambrose Bierce
> >
>
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