The RQS1000 is the thinnest format Quadratic Residue Diffuser available in the RealAcoustix line. With a low frequency cutoff of 1KHz and a high frequency range extending well above 6KHz, it also outperforms and 4" deep one-dimensional diffuser on the market. Designed for smaller spaces, the RQS1000 delivers great diffusion while saving space where required.