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. Its unique shape creates an attractive, visually interesting acoustical surface.

Problem
Specular 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.

Solution
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.

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.

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 a small emphasis at about 800Hz.

Installation
The Hemiffusor™ can be wall mounted or suspended in a standard T-bar grid.