I built this diffuser as a prototype to see how it will work. I used this calculator.
QRD Diffuser Well Depth Calculator
I didn't use the free acoustic calculator out there, because I don't have a windows computer.
I just used the rigid pink styrofoam that you can get at the Home Depot, and cut them to the required depths, and then glued them on their side onto a piece of hardboard.
I curious how much less effective this will be considering that their are no sidewalls to the wells, and the foam is not that dense.
These are just samples, so they don't look that good.
I'd love to hear your thoughts, how it could be better.
Thanks