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The
Abffusor® is the industry’s first absorption phase grating.
It is an extension of RPG®’s research on the reflection phase
grating (RPG) which provides sound diffusion from a series of divided
reflective wells of equal width and different depths. The depths of both
the reflective wells of the RPG and the absorptive wells of the Abffusor®
are based on mathematical number theory sequences. The Abffusor®’s
absorption efficiency extends below that of a traditional flat porous
absorber because it utilizes two absorption mechanisms.
The first is the traditional dissipation of sound energy into heat by
frictional losses in the pores of a porous absorber. The second is the
viscous losses due to high particle velocity flows across the well dividers
induced by the pressure differences in adjacent wells. This pressure gradient
mechanism results in additional low frequency absorption. The absorption
phase grating topology also offers efficient glancing angle reflection
control and near field diffusion to create a natural sounding, attractive
room treatment.
Problem
There is a need for a surface treatment that controls strong first order
reflections over a wide range of frequencies and angles of incidence which
also offers near field scattering to provide a natural ambiance.
Solution
The Abffusor® accomplishes solves these problems by using two absorption
mechanisms in addition to diffusion. Absorption extends to lower frequencies
than flat porous absorbers due to the QRD® pressure gradient mechanism.
Near field QRD® diffusion provides additional sound control.
 Absorption
The graph illustrates the absorption efficiency of the Abffusor®
for an A mounting directly on a wall and an E mounting
with a rear cavity depth of 16 inches. Note the excellent low frequency
absorption the Abffusor® offers when attached directly to a wall
and the improvement that is possible when a rear air cavity can be employed.
Installation
The Abffusor® can be mounted on a wall,
in a T-bar ceiling grid, or left free standing. Type
E Flush Mounting provides improved absorption. Hardwood feet are available
for free standing installation.
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Home:
Products:
Abffusor®
The
First Absorption Phase Grating From The Acoustical Industry’s Leading
Innovator
| Features
& Benefits |
Features
Similar appearance to a QRD®
734 Diffusor
Complimentary performance to a QRD® 734 Diffusor
Frictional dissipation and pressure gradient absorption mechanisms
Number theory surface topology
Modular and versatile
Attractive design element
Benefits
Can be used in conjunction with the QRD® 734 Diffusor to
provide an integrated visual design
Broad bandwidth abffusive performance compliments the broad
bandwidth diffusive performance of the QRD® 734 Diffusor
Frictional dissipation and pressure gradient absorption mechanisms
offer extended broad bandwidth random incidence absorption for
uniform attenuation
Irregular number theory surface topology effectively absorbs
and diffuses glancing incidence reflections more effectively
than a flat porous absober providing natural sounding reflection
control
Modular construction makes wall, drop ceiling, or floor mounting
simple and attractive
Wide variety of custom fabric finishes makes the Abffusor®
a decorative design element as well as a powerful acoustic tool
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