Peter,
I have always used the grey high-density foam from Clark Rubber,
which is fairly close in texture to the original foam that was used
in the Crown SASS design. And you won't have to glue either.
Vicki
On 28/02/2012, at 7:28 AM, Peter Shute wrote:
> Good enough for me then. I'll try to get there tonight and get some
> of the acoustic foam.
>
> The plans also say to fill the void with "dense absorptive material
> like rubber backed carpet padding". Does that mean similar material
> to that used for the baffle? I.e. can I just get a bit more of it
> to put in there?
>
> Peter Shute
>
> ________________________________
> From:
> On Behalf Of hartogj
> Sent: Tuesday, 28 February 2012 7:19 AM
> To:
> Subject: [Nature Recordists] Re: Foam for SASS
>
>
>
> Hi Peter,
> The open cell foam in the nose baffle is part of the original Crown
> SASS design, and that design has proven good for natural soundscape
> recording. I think the reason for sticking with the open cell
> design is mostly for the sake of consistency. Some low frequencies
> will pass through the foam nose, some frequencies are absorbed, and
> some will be reflected. The qualities of these transitions will
> depend on the specific material used.
>
> John Hartog
> rockscallop.org
>
> --- In <naturerecordists%
> 40yahoogroups.com>, Peter Shute <> wrote:
>>
>> I'm building a SASS array to Rob Danielson's design (https://
>> pantherfile.uwm.edu/type/www/audio-reports/BoundaryMicExperiments/
>> images/PBB2N-Plans_SASS-LikeDimensionsSept2010.gif), and I have
>> some questions about the foam used for the nose (baffle?)
>>
>> The plans say to use high-density open-celled foam, and I don't
>> know how to identify the stuff. I rang the local supplier (Clark
>> Rubber, which Australians would know), and they said they can cut
>> a piece for a few dollars. But when I mentioned what it was for,
>> they said it would be better to use acoustic foam, which doesn't
>> cost much more.
>>
>> They said it's similar, but denser. It also comes in thinner
>> sheets, so I'd have to glue two pieces together.
>>
>> Will it be better. Does it even matter?
>>
>> If the aim of the foam is to block sound from the other side, why
>> open cell? Does it work better for that?
>>
>> Sorry if these are basic questions, I don't know anything about
>> foams, their acoustic properties, and how this array works.
>>
>> Peter Shute
>>
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