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http://www.livesoundint.com/archives/2003/aug/three/three.php
http://stereophile.com/reference/704cutting
Time domain models of edge
diffraction
Diffraction
problems with loudspeaker cabinets
Curving
The
Loudspeaker
Enclosure design
Eliminates
a large number of variables when
designing mass-manufactured loudspeakers including the calculus
involved with baffle-step diffraction.
Our ultimate enclosure shape-materials have the ability to eliminate baffle-step diffraction and thus literally lessen the
work and cost involved with designing a proper loudspeaker system;
it allows previous engineering efforts to be easily modified to create
both Stellar - Sounding and Looking products- at a far lower percentage
of your current Engineering, Manufacturing and Driver costs.
Sound Diffraction at Rear-Corner of box- shaped speaker
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Curving your OEM enclosures also allows you to differentiate your
products from the competition while offering a Class-A finish, at a
manufacturing cost lower than any wood, metal or plastic curved loudspeaker
enclosure on the market, produced in any country. And properly-designed
curved
loudspeaker enclosures are Wife-Friendly as the home is filled
with curved objects
Port Soundwave Vortex
creates Standing Waves
Our
SHAPES reduce exterior diffraction and also reduce the additional smeared sound-quality
even the highest costing loudspeakers have which are caused by internal reflections which travel through the loudspeaker
cone... up to dozens of milliseconds after the sound was originally
reproduced by the drivers... both distorting the cone motion and also propagating
unwanted reflective sound even with near field monitors. No
electronics can hide the internal effects nor can any stuffing
reduce internal sound even 30 db let alone the 140 db found inside loudspeaker enclosures. Our shapes
and our materials together are literally The most technologically advanced
Loudspeaker
Enclosures available.
They simply improve loudspeaker sound quality in a way no
electronics can at a cost lower than your existing loudspeaker
enclosure costs and with higher visual quality. Our product
materials create a true breakthrough in loudspeaker technology.
Defeatable Internal Diffraction in
a curved loudspeaker cabinet.
US Enclosure’s
Technology can add tremendous value to a given OEM
loudspeaker system. This is accomplished by Smoothing and
Widening
the response.
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Loudspeaker
Definition is Enhanced...
SMOOTHING--
Lower exterior wall diffraction smoothes and sweetens the response.
Even the best
existing electronics can only crudely simulate this
effect. Less
diffraction from exterior walls also lowers
the delays created from sharp enclosure corners.
Our loudspeaker enclosure shapes also create far less
diffraction from the
enclosure's interior walls. The benefit is far less sound-pressure induced
loudspeaker
cone bleed-through of time delayed time-delayed sound from the
loudspeaker into the listening area.
WIDENING-- Lower exterior
cabinet surface diffraction from the causes soundstage widening.
Diffraction.
All waves diffract no matter their frequency. As an example, review diffraction
using
light waves. When a yellow
light wave diffracts, it slows and turns orange.
The exact same thing occurs
when a sound wave slows after encountering a loudspeaker
box corner... corners found either on the
inside of the box
or
on the outside of the
box-shape loudspeaker enclosure. The sound
changes from it's original quality.
Currently with standard box-shapes, both internal
and external
diffraction occur, both negatively effecting
And this is unacceptable now that
curved loudspeaker enclosures
can be manufactured that look as good or better than existing box-shaped
loudspeaker enclosures and with the same manufacturing costs than box-shaped
loudspeaker enclosures.
The mix of "yellow"
&
"orange"
sound causes loudspeaker enclosures to
negatively
"color"
it's sound.
OUR BENEFIT:
Your drivers
will sound more expensive when this
coloration is ( in practical-terms ) "eliminated" from the product's sound field. And we
can
provide
these benefits
to
your company at
the same or lower cost
than you currently are paying for box-shaped
cabinets. Our Design Division has a long-term proven
success record when your design
engineers request additional assistance.
Manufacturers using either
electronic or other
diffraction-compensation systems still have
the reality that
their compensation system has to properly
handle a 20- 60 hz to 8 - 10 khz wide bandwidth in real-time
and the compensated sound then still
travels
past both external and INTERNAL corners-- causing
time-delayed bleed through the driver cones from
internal
diffraction & phase-shifts from exterior cabinet
corners as external
diffraction.
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The Following Charts Show the Exterior Diffraction Effects Caused By
Loudspeaker Enclosures
Compensation via electronics or Loudspeaker
driver placement/aiming can only create a rough equivalent of the benefit of
using curved loudspeaker enclosure shapes because the sound-spectrum bandwidth
is far too wide for non-enclosure compensation.
These graphs do not describe the
further benefits of internal diffraction reduction caused by focusing the
internal sound waves into the center of the enclosure and also into the rings of
Sound Diffraction found along the interior surface of the enclosure. Both
effects cause far less time-delayed sound-bleed through the speaker cones--
which destroys sound-quality in the listening area outside the loudspeaker
system. Using sound-absorbents can reduce reflections by 20db maximum.
Proper curved internal wall design can reduce the internal reflections by close
to 100%. These effects are not on these charts, which just show the
benefits of external diffraction.
The Results, from Dr. Olsen in
the late 1930's, show that any loudspeaker driver or driver array will
benefit from a curved loudspeaker enclosure. This benefit will gain increased
sales in the marketplace.
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