Hello Vicki,
Tried to email you off list, about paying a visit sometime. Email bounced.
Paul
--- In vickipowys <> wrote:
>
> Paul,
>
> I am in Capertee Valley which is up towards Mudgee, Central
> Tablelands of NSW.
>
> Vicki
>
>
> On 27/09/2010, at 8:18 AM, thesilverloon wrote:
>
> > Thanks again everyone. Will checkout Clark Rubber and get the ball
> > rolling.
> > Vicki, can I ask where you are based?
> >
> > Paul
> >
> >
> > --- In vickipowys
> > <vickipowys@> wrote:
> >>
> >> Hello Paul,
> >>
> >> I got my dark grey foam from Clark Rubber. My nearest store is Dubbo
> >> (4 hours drive away) so I had to get it by mail order. Clarks
> >> describe the foam as 'high load' open cell foam. It seems to be
> >> about the same density as the original black foam in my Crown SASS.
> >> Clark will cut the foam for you, but they are not always spot on with
> >> their right angles or measurements! Better to buy larger pieces and
> >> cut them yourself, use a craft knife. Extend out a full row of new
> >> snap-off blades, and cut carefully along marked lines. An electric
> >> knife would be good but I don't have one. When you have cut the foam
> >> to size and rounded the edges as good as you can with a craft knife
> >> and scissors, you can do a final smoothing touch up with very fine
> >> sandpaper. But you need to do all the actual shaping with the craft
> >> knife.
> >>
> >> cheers,
> >>
> >> Vicki
> >>
> >>
> >>
> >> On 27/09/2010, at 6:40 AM, thesilverloon wrote:
> >>
> >>> Hello Vicki,
> >>> Can I ask where you sourced the foam for your nosepiece?
> >>> The density that Rob suggests does not seem to be easily found.
> >>> Most open cell foams
> >>> that I can find have a far higher density than what Rob recommends.
> >>> I live in Sydney by the way.
> >>>
> >>> Paul
> >>>
> >>> --- In vickipowys
> >>> <vickipowys@> wrote:
> >>>>
> >>>> All,
> >>>>
> >>>> For my various SASS clones I have been making stretchy covers from
> >>>> lightweight lycra fabric, which protects the mics from a light
> >>>> breeze
> >>>> and is acoustically transparent. Over this I use a fine-knitted
> >>>> beanie without any high frequency loss that I could detect. I've
> >>>> also tried a loose-knitted mohair scarf, 2 layers of it, which is a
> >>>> bit better at wind protection than the beanie and lets through hf.
> >>>> As Rob says, fur fabric seems to cut out too much hf, I have found
> >>>> this as well.
> >>>>
> >>>> I am just now knitting a large mohair beanie (green!) for a DIY
> >>>> 'fur'
> >>>> cover that is designed to be acoustically transparent.
> >>>>
> >>>> If you wanted to make something even more windproof you could
> >>>> experiment (as Rob has done) with a shield about the size of a
> >>>> large
> >>>> hatbox but with fabric sides rather than cardboard. That way you
> >>>> would have say 6 inches of dead air space between the fabric walls
> >>>> and the mics. Maybe try one of those collapsible laundry/ garden
> >>>> baskets and re-do the fabric? Endless possibilities!
> >>>>
> >>>> Vicki
> >>>>
> >>>>
> >>>> On 25/09/2010, at 3:57 PM, Rob Danielson wrote:
> >>>>
> >>>>> 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>
> >>>>>> Rob Danielson <type@> 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
> >>>>>>>
> >>>>>>>
> >>>>>>> --
> >>>>>>>
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> > "While a picture is worth a thousand words, a
> > sound is worth a thousand pictures." R. Murray Schafer via Bernie
> > Krause.
> >
> > Yahoo! Groups Links
> >
> >
> >
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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