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The Modffusor represents the evolution in architectural acoustics toward aperiodic sequencing of asymmetrical shapes . The Modffusor is a furniture grade, natural wood sound diffuser designed to provide a more uniform sound field through mid and high frequency sound diffusion while limiting the amount of sound absorption.


The Modffusor is available in a wide variety of finishes, including wood veneer, laminates, melamine coatings and painted surfaces. See some of the options displayed under the Finishes tab below.


The Modffusor can be mounted to a wall or ceiling surface with the provided wood cleats. Due to it’s depth, it is often recessed into a wall or ceiling cavity. See details below under the Drawings tab.

Modffusor is a Trademark of RPG Acoustical Systems LLC

Modffusor 1D Wood Sound Diffuser

Modffusor features img

To minimize the lobing inherent in number theory sound diffuser designs, which compromises the uniformity of the scattering, RPG developed the Modffusor. The computer optimized Modffusor offers significantly better performance than its predecessor, the QRD 734, and in a shallower profile. Where the performance difference advances further is when multiple units are installed in an array. An optimized, modulated sequence of an array can take advantage of the aperiodic, asymmetric shape of the Modffusor to minimize lobing effects that are caused by symmetrical and periodic shapes. In contrast to a QRD periodic array, a Modffusor aperiodic array is formed by following the prescription of an optimal binary sequence, which indicates when to use the asymmetric base shape (zero) or the rotated unit (one). The Modffusor is available in a wide variety of finishes, including wood veneer, laminates, melamine coatings and painted surfaces. It is designed to fit into a standard, reinforced T-Bar grid; more often, it is flush mounted to a wall or ceiling with the included mounting cleat.


Interfering reflections that degrade speech intelligibility, gain before feedback, and music quality can be controlled by absorption and/or diffusion. When absorption alone is used to control reflections it creates “dead” sounding spaces that lack the benefit of late order, high frequency reflections which can greatly enhance the acoustic performance of a space. Quadratic residue diffusers (QRDs) are the most common type of sound diffusers on the market, and owe their sound diffusing ability to the phenomenon of diffraction from a periodic reflection phase grating. To cover wide areas, the units have to be repeated in a periodic fashion. This periodicity decreases the attainable uniformity, reducing its performance as the width of the array increases.


To solve this problem, RPG developed a new optimized sound diffuser called the Modffusor. The Modffusor embodies two patents; Shape Optimization and Aperiodic Modulation of a Single Asymmetric Base Shape. The optimized, asymmetric base shape of the Modffusor consists of 7 full wells and two zero-depth, half wells on either end. This optimized asymmetric surface is now capable of being arrayed in an aperiodic manner, using optimal binary sequences. This offers a significant performance advance over QRD designs.


  • Offers broad bandwidth sound diffusion in a decorative, wood cabinet.
  • Multiple unit arrays can be sequence optimized for further improvement in scattering.
  • Comes in a variety of finishes, including wood veneer, laminate, melamine and custom paint colors.
  • Comes standard 7-7/8″ depth; can be customized for either shallower or deeper units.
  • Simple installation with included mounting cleat.

RPG Wood Products can be manufactured to match most commercially available and custom wood veneers.

Common Wood Species

Ash 1

Stocked product samples are typically manufactured using common wood species – no products are available at any one time in all of the above species. Please check with your local rep or contact RPG.