One Dimensional QRDs


The RealQuad Studio line of one-dimensional Quadratic Residue Diffusers (QRD) is the most comprehensive array of models in the acoustics industry.  RealAcoustix offers (5) different models which are based on the low frequency cutoff per Schroeder's equation.  Additionally we offer (4) different standard heights for a total of (20) standard models.

All models are sequence 11 with better high frequency performance and resolution than competitive models on the market today.



The RQS250 is the largest format Quadratic Residue Diffuser available. With a low frequency cutoff of 250Hz and a high frequence range extending well above 6Hz, it also outperforms any one-dimensional QRD on the market.  Designed for larger studios, rehearsal halls and concert spaces, the RQS250 delivers unprecedented sound diffusion over the largest range available.


Click Here for RQS250 Cutsheet PDF Version


The RQS350 is the second largest one-dimensional diffuser in our product line.  With a low cutoff of greater the 350Hz, the RQS350 can optimize the diffusive nature of even the largest room.  Due to it's thinner cells and higher prime number, it also performs better than any quadratic residue diffuser in it's class.


Click Here for RQS350 Cutsheet PDF Version


The RQS450 is the most popular QRD in the RealAcoustix line.  With a low frequency cutoff of 450Hz and a high frequency range extending well above 6KHz. 


Click here for RQS450 Cutsheet PDF Version


The RealAcoustix tradition of making the finest QRD's continues with the RQS500.  With full symmetry in each unit, they can be placed in any array with confidence.  The RQS500 is made of the finest hardwood veneers with stable MDF cores.  When you need the best diffusers on the market, think RealAcoustix.


Click here for RQS500 Cutsheet PDF Version


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.


Click here for RQS1000 Cutsheet PDF Version