At 1:42 AM +0000 9/25/10, thesilverloon wrote:
> 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
>effective.
The stretchy material cover works pretty good until the wind gets
into 15+ mph range. Vicki Pows adds a wooly layer to the stretchy
material she can comment about. A single layer of burlap in a full
surround of dead air is working pretty well for me up to about 25-30
mph. I couldn't get fake fur to work in proximity to the SASS body
without too much HF loss. Rob D.
=3D =3D =3D
>I would be mounting my AT 4022'S into this setup if I were to build one.
>
>Paul
>--- In
><naturerecordists%40yahoogroups.com>=
m,
>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 good
>> 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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