QRD Diffuser Calculator
Schroeder QRD well depths for a quadratic residue sequence design.
How the QRD diffuser calculator works
Enter lowest design frequency, number of wells, well width, and speed of sound. A quadratic residue sequence sets each well depth; the tool reports panel width, maximum depth, approximate bandwidth, and minimum listening distance.
Key terms
- QRD (quadratic residue diffuser) - Schroeder diffuser that scatters sound in time and space.
- Well depth - physical depth of each slot; deeper wells handle lower frequencies.
- Design frequency - lowest frequency at which diffusion is effective.
Frequently asked questions
- What is a QRD diffuser? A Schroeder diffuser that scatters sound using wells of different depths based on a quadratic residue sequence.