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Re: Foam for SASS

Subject: Re: Foam for SASS
From: "vickipowys" vpowys
Date: Mon Feb 27, 2012 3:21 pm ((PST))
Peter,

re filling inside of SASS box - well I've overcome that problem by
making my SASSes out of solid blocks of closed-cell foam (it's
lighter weight too) - see my website.  If you've made a wooden SASS
you could fill the gap with closed cell foam.

Vicki


On 28/02/2012, at 9:08 AM, Peter Shute wrote:

> Excellent, if I can tell by colour then they can't trick me. It
> sounds pretty cheap, so I'll get enough for future experiments.
>
> Can you recommend what to fill the inside of the box with?
>
> Peter Shute
> ________________________________
> From: 
>  On Behalf Of vickipowys
> Sent: Tuesday, 28 February 2012 8:54 AM
> To: 
> Subject: Re: [Nature Recordists] Re: Foam for SASS
>
>
>
> Yes Peter, Clark Rubber call their stuff 'high density foam' and it
> is grey in colour (as opposed to medium density foam which comes in
> many colours). The acoustic foam is black. My nearest Clarks used
> to be at Bathurst (2 hours away) but they closed and now I have to
> get it via mail order from Dubbo where they can never cut it
> straight. I agree Clark's website is pretty useless. If you can get
> Clarks to cut it in blocks around the size you want, you can then
> taper the sides according to Rob's specifications, using a razor
> knife with a new blade extended all the way out. And tidy up the cut
> surfaces with a little piece of fine sandpaper.
>
> Vicki
>
> On 28/02/2012, at 8:17 AM, Peter Shute wrote:
>
>> Thanks, Vicki. You mean the one they're calling high density but
>> which isn't acoustic foam? If that works then it would be better
>> not to have to glue it.
>>
>> It's a pity I can't see the stuff on their web site before I go
>> there, or even just order it online to save myself the trouble, but
>> the web site is a mess. A search for high density foam takes me to
>> anything but what I expect to see.
>>
>> Peter Shute
>>
>> ________________________________
>> From: <naturerecordists%
>> 40yahoogroups.com>
>> <naturerecordists%
>> 40yahoogroups.com>] On Behalf Of vickipowys
>> Sent: Tuesday, 28 February 2012 8:06 AM
>> To: <naturerecordists%
>> 40yahoogroups.com>
>> Subject: Re: [Nature Recordists] Re: Foam for SASS
>>
>>
>>
>> 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: <naturerecordists%
>>> 40yahoogroups.com><naturerecordists%
>>> 40yahoogroups.com>
>>> <naturerecordists%
>>> 40yahoogroups.com><naturerecordists%
>>> 40yahoogroups.com>] On Behalf Of hartogj
>>> Sent: Tuesday, 28 February 2012 7:19 AM
>>> To: <naturerecordists%
>>> 40yahoogroups.com><naturerecordists%
>>> 40yahoogroups.com>
>>> 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><naturerecordists%
>>> 40yahoogroups.com><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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