The Q'Fusor Sound Diffusor is a design derived by combining a standard quadratic residue sequence with other mathematical techniques, creating a profile that optimizes scattering surfaces. This is combined with an overall depth of approximately three inches, providing superior diffusion down to a frequency of around 800Hz. Sonically, this means more accurate control of sound reflections in the room without making the room sound flat. The 21 3/4" x 21 3/4" x 2 5/8" panel is extremely affordable and easy to install.