QRD734

Overview

The QRD734 has become a classic shape in architectural acoustics, from its birth in 1987 it can now be found in churches, schools, theaters and studios all over the world. The surface of the QRD734 is designed to provide a more uniform sound field through mid and high frequency diffusion while the natural wood construction of the unit limits the amount of sound energy that is removed by absorption.

Finish
The QRD734 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.

Installation
The QRD734 is designed to fit into a standard, reinforced T-Bar grid. More often, is it flush mounted to a wall or ceiling with appropriate blocking. Due to it’s depth, it is often recessed into a wall or ceiling cavity. See details below under the Fitting Options tab.

QRD® 734 1D Wood Sound Diffuser
The phase grating surface of the QRD® 734 is designed to provide a more uniform sound field through mid and high frequency diffusion while the natural wood construction of the unit limits the amount of sound energy that is removed by absorption. It has become a classic shape in architectural acoustics; from its birth in 1987 it can now be found in church, theater and recording studio spaces all over the world. Its wide bandwidth, low cost, and broad selection of finishes also make it a logical choice for music education facilities, auditoriums and performing arts facilities.
The QRD® 734 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.

Problem
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 reflections which can greatly enhance the acoustic performance of a space.

Solution
The QRD® 734 is first and most applied sound diffusing panel in the world. Rather than remove the energy that strikes key surfaces in a space, the QRD® preserves the energy by uniformly distributing the energy back into the space. The onset of diffusion for the QRD® 734 occurs at roughly 320 Hz.

Features

  • Offers broad bandwidth sound diffusion in a decorative, wood cabinet.
  • Comes in a variety of finishes, including wood veneer, laminate, melamine and custom paint colours.
  • Comes standard 230 mm depth; can be customised for either shallower or deeper units.
  • Simple installation with included mounting cleat.

The QRD® 734 is available in a range of veneered MDF finishes or RAL colours, or plain as a fabric covered unit. Modfractal is also available, integrating smaller diffusors into the wells of the product as with a standard DFR design. This flexibility enables for a fully customisable end product.

Compared to a a flat reflector panel, the QRD 734 offers significant diffusion above the diffraction limit of 565Hz, which is equal to the speed of sound divided by the 600 mm dimension of the panel. As the frequency increases above 565Hz, the graph indicates how the reference reflector becomes more and more spectacular, whereas QRD 734 provides uniform diffusivity.

The QRD® 734 is designed to fit into a standard, reinforced T-Bar grid. More often, is it flush mounted to a wall or ceiling with appropriate blocking. Due to it’s depth, it is often recessed into a wall or ceiling cavity. See details below under the Drawings tab.