DIY Block Diffuser Calculator
Plan a square wooden block panel. Choose your dimensions, calculate each block height and print the cut list.
Illustrative block layout — enter your real dimensions below to calculate yours.
Your build plan
Front-view technical drawing
Drawn directly from your calculated block heights — row 1 numbering shown along the top edge, overall panel size and maximum block height labeled from your real inputs.
Exact values · block height in mm
Top row = top of panel. A zero is an exposed backing-board position, not a block to cut.
Cut list
| Height (mm) | Quantity | Stock length including kerf (mm) |
|---|
How this plan works
The two-dimensional residue sequence is s = (x² + y²) mod N, with x and y from 0 to N − 1. Reference well depth is d = s × 343000 / (2 × N × f) mm. Block heights are the complementary surface: h = maximum(d) − d. Heights are rounded to 0.1 mm for the cut list. Sound speed is fixed at 343 m/s.
This is a single-period, finless block layout. Open blocks do not behave identically to separated QRD wells. The design frequency and width-based frequency scale are geometric references, not a verified operating band. Finite size, placement, material and repeating identical panels all affect scattering.
Use square stock of the chosen width, with no gaps assumed. The backing board, frame, fixings and stock-end trimming are not included in the timber estimate. Allow extra stock for defects and mistakes. Check the finished panel weight and use wall fixings suitable for your wall and load; diffusion does not replace bass trapping or absorption.
Method references: experimental research on 2D quadratic-residue diffusers and QRDude design notes. Read Absorption vs Diffusion for placement context.
Need absorption too, not just diffusion?
The Acoustic Treatment Planner sizes both absorption and diffusion together for your actual room, instead of one panel type in isolation.
See the Acoustic Treatment Planner