1-3 working days delivery for in stock items (unless stated otherwise on the product page); may be longer for rural postcodes. For more information
Interfering reflections that degrade speech intelligibility, gain before feedback, and music quality can be controlled by absorption and diffusion. Since commercial surfaces that provided uniform diffusion over a wide frequency range and for all angles of incidence were not available, absorption was used solely to control reflections. This treatment created 'dead' spaces.
The QRD 734 is a quadratic residue acoustic diffuser based on mathematical number theory. Now a predictable diffusive surface treatment is readily available.
Compared to a flat reflector panel, the QRD 734 offers significant diffusion above the diffraction limit of 565Hz, which is equal to the speed of sound (1130ft/sec) divided by the 2' dimension of the panel. As the frequency increases above 565Hz, a reflector becomes more and more specular, whereas the QRD 734 provides a uniform diffusivity. Diffusion starts at around 320Hz
The wooden QRD® 734 contributes minimal absorption.
The QRD 734 is typically mounted on a cleat and secured. For installations that require a flush mount the units should be framed out much like an opening for a window.