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 Hemiffusor™ 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.
ProblemSpecular 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. Sound strikes a two dimensional
diffusing surfaceand is uniformly scattered into a hemisphere.
SolutionThe Hemiffusor™ is the first and most affordable
2D QRD®.It offers twice the reflection attenuation of the
1D QRD®, because it uniformly scatters sound into a hemisphere.
The Hemiffusor™ provides uniform, omnidirectional, broad
bandwidth diffusion in an attractive ceiling or wall design element.
Absorption
While the primary function of the Hemiffusor™ is to provide
broad bandwidth diffusion, it also offers a modest and beneficial
amount of absorption across the frequency spectrum with emphasis
at 315 Hz and 800 Hz.
Diffusion
The Hemiffusor™ offers significant diffusion compared to
a flat reflector panel above the diffraction limit of 565 Hz,
which is determined by the dimensions of the panel. Above this
frequency, the graph indicates how the reference reflector becomes
more and more specular as the frequency increases, whereas the
Hemiffusor™ provides a constant diffusivity.
Installation
The Hemiffusor™ can be wall mounted or suspended in a standard
T-bar grid.
Features
2D QRD® reflection phase grating
Uniform hemispherical scattering forall angles of incidence
Simultaneously offers diffusion andmoderate mid band absorption
2D QRD® provides twice the diffusivespecular attenuation of
a 1D QRD®
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 Hemiffusor™ ideal for
ceiling applications.The omnidirectional diffusive attenuation,
coupled with moderate mid band absorption, provides ideal reflection
control without deadening the space
Modular 2' x 2' panels can be wall mountedor suspended in a 15/16"
standard duty T-bar ceiling grid
More product info : http://www.rpginc.com
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