Binary Amplitude Slat Diffuser Calculator

[ssashton]

I wanted to build a floor to ceiling absorber and cover the front with some slats to offer some diffusion in the midrange. However, I could not find an online calculator for binary amplitude slat diffusers. Most are for QRD diffusers with variable cell depth. So I made a little HTML calculator which I am sharing here. Please feel free to re-distribute it or host.

I made it this way because I wanted to choose a visually pleasing an practical pattern for my build.

I want to make a diffuser similar to this but to my own spec:

 

[ssashton]

P.S. You can make curved ones like this no problem. Unlike a QRD with varied depth wells, the binary amplitude mask can just be mapped to the profile and will still work to improve diffusion. This is the one I plan to make, 800mm wide, 2400mm tall. Slats will be 6mm birch plywood. Depth is 250mm on the left side, 150mm on the right.
I shifted the sequence so both sides of the frame count as part of the reflective cells.

 

[Kyban]

I take it the curved profile acts like a poly diffuser? I just complete this build today.

Poly curve, from 4" bands of 1/8" hardboard, separated by 1" slots; behind is loosely packed with rock wool. Your approach gives me additional design options for my room.

 

[ssashton]

For me, the curve is just to have thicker absorber but not seem too intrusive in the room. However a gentle convex curve like you show could help with scattering on top of the binary amplitude diffusion.