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
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
(CLICK
GRAPH TO VIEW)
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.
APPLICATIONS
- Recording studios
- Post production studios
- Listening rooms
- Home theaters
- Public spaces
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Northampton, MA 01062 
