Project Description


Hemiffusor is the first two-dimensional QRD – ideal for Home Theatres and Project Studios.

Conventional acoustic treatments have relied on absorption for reflection control. Unfortunately, this can “deaden” the room and result in making it unsuitable for speech and music. Diffusive ceilings are one of the most effective ways to simultaneously control room reflections and provide a natural ambience. The Hemiffusor uniformly scatters sound arriving from any direction, providing ideal distribution and coverage.

Hemiffusor’s unique shape creates an attractive, visually interesting acoustical surface.

Specular reflections from flat, hard surfaces cause strong reflections, which corrupt speech intelligibility and degrade music quality. Typically, fabric wrapped panels are sued to control interfering reflections. This has the undesirable side effect of deadening the space.

The 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.


  • 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 power of a 1D QRD
  • Available in modular 600 x 600 mm panels

600 x 600 x 120mm

Finish options:
White or Grey plastic as standard
Any RAL paint available

Acoustic Data

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. Compared to flat reflector panels, The Hemiffusor™ offers significant diffusion above the diffraction limit of 565 Hz, which is determined by the dimensions of the panel.

Wall mounted with concealed battens or lay-in grid tile

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