Hi Rob, Thanks for the description of the SASS, I have never really taken t=
hat close of a look at one.
While baffles will tend toward absorptive, and boundaries toward reflective=
, whatever material or combination of materials is used will hold a unique =
position on a continuum between ultimately absorptive and ultimately reflec=
tive. It may be easy to speculate the general theories behind the SASS, bu=
t why in practice it works so well might depend on more complex variables o=
f its design.
John Hartog
--- In Rob Danielson <> wrote:
>
> At 7:21 PM +0000 3/13/10, hartogj wrote:
> >
> >
> >Hello,
> >
> >I would say the SASS is a hybrid - a baffled boundary array.
> >
> >John Hartog
>
> Hi John--
> Good point. Although Crown describes the foam as a "barrier," both
> absorption and barrier functions appear to be present in the mass and
> planes formed by the foam "nose." The metal wrapping around the nose
> potentially creates some enclosure. With the capsules positioned at
> the intersection of where the foam meets the hard boundary, there
> could be some double-boundary effect, somehow. Multiple boundaries
> were a hot idea at Crown around the time the SASS surfaced.
> Surprisingly, SASS rigs are hollow enough to ring when thumped. A DIY
> SASS with all the "magic" has remained elusive for everyone I've
> known that has attempted it, but someone will surely figure the
> design principles out.
>
> I'm hoping it will be instructive to better characterize what seems
> to be a midrange lift in Paul's and Andrew's comparison. :-) Rob D.
>
> =3D =3D =3D
>
> >
> >--- In
> ><naturerecordists%40yahoogroups.com>=
com,
> >Rob Danielson <type@> wrote:
> >>
> >> Hi--
> >> In interest of keeping our term usage somewhat consistent, I'm pretty
> >> sure that the wooden boundaries in David's rig would not be
> >> technically described as "baffles." Baffles are used primarily to
> >> absorb sound like the separator in a Jecklin Disk, and boundaries are
> >> designed to reflect sound or create a pressure zone. The SASS and the
> >> Curt's head-spaced arrays made of wood, are both "Boundary" arrays.
> >> The SASS uses the pressure zone formed on the boundary surface with
> >> flush mounted capsules. Curt's perpendicular to boundary capsule
> >> mounting chiefly uses reflection. Rob D.
> >>
> >> >
> >
> >
>
>
> --
>
>
>
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