The QRD-1 is a versatile sound diffusor designed for a variety of venues, including recording studios, auditoriums, performing arts facilities, and theaters. Its modular phase grating creates a directional hemispheric polar response and can be oriented in any direction, making it highly adaptable to different acoustic environments. The QRD-1 surface provides full-spectrum sound diffusion by combining the self-similarity properties of fractals with the uniform scattering property of a phase-optimized sound diffuser. This innovative design expands the bandwidth and offers the broadest spectrum of sound diffusion available, allowing for optimized array sequencing and enhanced performance. The wide bandwidth of the QRD-1 makes it an all-in-one solution for addressing various acoustic issues in multiple rooms. Installation is straightforward with our custom-made cleats system, allowing the diffusor to be quickly and easily mounted on any wall surface. The QRD-1 offers a cost-effective, broad bandwidth, and highly efficient sound absorption solution for reverberation control. It is available in dimensions of 2’0” (width) x 4’0” (length) x 5” (thickness). All components are Class A Fire Rated, ensuring safety and compliance.