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Conventional
acoustic treatments have relied on absorption for reflection control.
Unfortunately, this can "deaden" the room and make it unsuitable for speech
or music. Diffusive ceilings are one of the most effective ways to simultaneously
control room reflections and provide a natural ambiance. The Omniffusor® uniformly scatters sound arriving from any direction
into many directions, providing ideal distribution and coverage. It’s
unique shape creates an attractive, visually interesting acoustical surface.
Problem
Specular reflections from flat, hard surfaces cause strong reflections
that corrupt speech intelligibility and degrade music quality. Typically,
fabric wrapped absorptive panels are used to control interfering reflections,
with the undesirable side effect of deadening the space.
Solution
The Omniffusor® is the first two dimensional QRD® sound diffuser of its kind. It offers twice the reflection
attenuation of the 1D QRD®, because it scatters sound uniformly into
a hemisphere. The Omniffusor® provides uniform, omnidirectional,
broad bandwidth diffusion in an attractive ceiling or wall design element.
Absorption
 It was discovered that phase gratings, consisting of wells of
different depths separated by dividers, also may provide sound absorption.
The absorption is caused by viscous losses created by high particle velocity
flows over the dividers, between wells of different depths and resonant
frequencies. The absorption can be enhanced by placing a resistive element,
e.g. fabric, near the face of the phase grating. A supplemental sound absorption data sheet illustrates
the absorption performance uncovered, with fabric directly on the surface
and at 2" and 7" above the surface.
Diffusion
The Omniffusor® offers significant diffusion above the diffraction limit of 565 Hz, which is determined by the
dimensions of the panel. The chart displays the mean diffusion coefficient, which is the normalized standard deviation of the 1/3 octave polar responses for angles of incidence between 0° and 90°, the normalized scattering coefficient for computer modeling calculations and the A-mount absorption coefficient for reference.
Installation
Wooden Omniffusors® can be wall mounted.
For wall installation, plexiglass Omniffusors™ should be flush mounted
into a framed opening. Decorative trim can be added to conceal the perimeter
joint.
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Home:
Products:
Omniffusor®:
The First Two Dimensional QRD® Sound Diffuser From The Acoustical Industry’s
Leading Innovator
| Features
& Benefits |
Features
2D QRD® reflection phase grating
Uniform hemispherical scattering for all angles of incidence
Simultaneously offers diffusion and moderate mid band absorption
2D QRD® provides twice the diffusive specular attenuation
of a 1D QRD®
Available in plexiglass:
Available in modular 2' x 2' panels
Benefits
The 2D QRD® provides phase variation in two orthogonal
directions for uniform omnidirectional scattering
Hemispherical scattering makes the Omniffusor® ideal for
ceiling applications because the incident sound is uniformly
distributed throughout the room from a planar ceiling surface
The omnidirectional diffusive attenuation, coupled with moderate
mid band absorption, provides ideal reflection control without
deadening the space
The wide range of wood finishes makes the Omniffusor® an
attractive architectural addition to a space
Modular 2' x 2' panels can be wall mounted or suspended in a
15/16" heavy duty T-bar ceiling grid |
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