A wave shaped premium panel Features Type:1D - Geometric DiffuserSchroeder Optimised curve.Scattering range:400 Hz to 5000 Hz Purpose - Improving low frequency response - Flutter echo control - Specular reflection control - Enlarging sweet spot Douro is a geometric diffuser, designed to scatter and diffuse mid-high frequencies. The solid construction of the unit limits the energy lost to absorption, helping you create a balances, homogenous sound field.The Wave shaped pattern guarantees a uniform diffusion pattern. Scattering begins at 400 Hz and offers effective and even diffusion up to 5000 Hz. Douro is available in two sizes, in a selection of premium wood and lacquered finishes.Douro can be used on walls and ceilings, and can be mounted in any orientation, according to the diffusion pattern you need. Performance Scattering coefficient / Absorption Coefficient A WAVE SHAPED PREMIUM PANEL.OPTIMISED CURVE. Recommended for - Hi-Fi Listening Room - Media Room - Home Cinema Type: 1D - Geometric DiffuserSchroeder Optimised curve.Scattering range: 400 Hz to 5000 HzThis product is available in the following Fire Rate:FG | Furniture GradePRODUCT COMPOSITION:Douro | Natural wood- Natural wood veneer- HMDF and plywood structureDouro | Lacquered wood- Lacquered HMDF- HMDF and plywood structureRange Dimensions:Douro | 595x595x82mmIntegrated Fixing System Fixing Systems Wall & Ceiling + FixArt Tube + FixArt Clip