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Re: Creating delrin mic supports for SASS

Subject: Re: Creating delrin mic supports for SASS
From: "thesilverloon" thesilverloon
Date: Fri Sep 24, 2010 6:42 pm ((PDT))
Rob, thanks for that info.
There's now no good reason not to build one.
Maybe except for one. Wind protection. How well can they be baffled against=
 the wind?
The original windsock supplied by Crown, would not appear to be that effect=
ive.
I would be mounting my AT 4022'S into this setup if I were to build one.

Paul
--- In  Rob Danielson <> wrote:
>
> Hi Paul--
> Can one make a baffle using high-density foam that will provide
> comparable or indistinguishable performance? Its definitely doable.
> There are several types of high-density, _open cell_ foam out there.
> I tested four or five kinds and found they did pass pink noise with
> very slight differences.  A neat aspect of foam baffle is it cleanly
> passes some sound energy under < 1100Hz to the off-side mic. These
> frequencies are critical for time arrival differences. Michael
> Billingsley doesn't mention this aspect of the baffle in his SASS
> patent as far as I can tell. Would different types of foam make
> audible differences?  All we need to do is make some up and compare
> them to find out.
>
> Cutting and sanding the foam to fit snuggly into the crown housing
> would take some time. Vicki Powys discovered that sanding is a god
> way to get the final shape and dimensions.
>
> Any open cell foam that has a density of 1.5 to 1.8 pounds per cubic
> foot and is at least 4 inches thick should perform to Billingsley's
> high frequency absorption specifications. I use "charcoal gray"
> acoustic foam.   A 10" X 10" X 4"  piece should be sufficient to make
> a SASS baffle replacement.  Measure twice, cut once.  Rob D.
>
>   =3D =3D =3D =3D
>
> At 11:27 PM +0000 9/24/10, thesilverloon wrote:
> >Does anyone know how important using the correct foam for the nose piece=
 is?
> >One can buy just the foam nose piece from Crown as a spare part, and
> >then build the rest.
> >Thats still $100 landed in Australia. But if any closed cell foam
> >would work,that would make the project that more do-able.
> >
> >Regards,
> >
> >Paul
>
>
> --
>








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