The RealDiff HDS was designed to meet the needs of customers who want great diffusion without the high cost, while still maintaining the professional look of our RealDiff line. With a thinner design, the RealDiff HDS has an effective operating range of 1800Hz to well above 7500Hz. The optimized cell structures offer the same high-quality diffusion you expect from all RealAcoustix products. The RealDiff HDS is available in maple wood only and has the same attractive appearance of the rest of the RealDiff line of 2D diffuser.