The RealDiff HV is a two-dimensional quadratic residue diffuser with a low frequency cutoff of 1KHz and a prime number 11 design criteria. This new two-dimensional design ensures equal scattering/diffusion in both the horizontal and vertical planes as well as adding much greater high frequency response in a stunning architectural format. This is ideal for concert halls, performance spaces, choir and band rooms, recording studios and other environments where equal dispersion of diffuse frequencies is desirable. The RealDiff HV was designed specifically to provide an alternative to the standard 2D diffuser designs that have been around for a number of years. Additionally, the unique mounting method of the RealDiff series of diffusers means you get the job done faster and more precise than ever.