Hey all,

First, a big thank you for the blueprint!

I just received the leanfractal email... The one about the fractal cell build... I was wondering what are the inches equivalent? I will use ½inches plywood to build the leanfractal... I know we have to stick to 60mm well, but have to double the 10mm for depth (10mm is ½ (or 12mm)).

But I am not sure about the small cell dimension, depth, wide, height.

Thesis says : 11, 14, 9, 14, 11 mm. Since it's mm, really hard to convert it to inches because of the small mm difference.. I'm puzzled.. Or I should just slice them using mm dimension but that would be a amazing amount of work if I don't mill them... Thanks for any help on this one! I added an inches version for the current panel.

I attached the picture included in the email and another picture of diffusers I built with different type of wood.

And here is the FAQ.

"In the thesis I used a fractal step increment of 2.85mm for the fractal cells (see Tables 5 and 6 on page 51 of the thesis). Anything smaller than this would have taken too long to simulate, and would have left a performance gap in the diffusion spectrum. The resulting depth sequence for the small fractal cells is [0, 11.4, 14.25, 8.55, 14.25, 11.4 0] mm. To make milling easier you can round the sequence to [0, 11, 14, 9, 14, 11 0] mm.

If you prefer a spikier look you can increase the depth of the fractal cells. For example, if the depth of the fractal cells are doubled they would be about [0, 22, 28, 17, 28, 22, 0] mm deep. Or you can simply use [0, 20, 25, 15, 25, 20, 0] mm, which are the fractal dimensions that Schaap demonstrates here. Increasing the fractal cell depth is likely to increase the high frequency performance, but if you take this to the extreme these deeper fractal cells may be fragile."