QRD
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How Schroeder Diffusers Work: The Math Behind QRD Scattering
Explore how Schroeder diffusers use quadratic residues and reflection phase, what Fourier theory predicts, and how polar response reveals real limits.
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How to Build a QRD Diffuser: Cut List and Depths
A worked cut list for a seven-well quadratic residue diffuser, plus fin seating, mounting distance and the reasons a finished panel does nothing.
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QRD N7, N11, N13 and N17: Well Depth Tables and Formula
Use the QRD well-depth formula and worked N7, N11, N13 and N17 tables to choose a prime from design frequency, well width or maximum panel depth.
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Types of Acoustic Diffusers: QRD vs Skyline vs BAD
How one-dimensional wells, two-dimensional block arrays and binary amplitude panels differ in scattering plane, depth, absorption and best placement.
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Acoustic Diffusers: How They Work vs Absorption
Learn how acoustic diffusers redistribute reflections, how diffusion differs from absorption, and which measurements help assess a panel for a room.