How to make Binary Amplitude Diffusers without a CNC

Short answer: drill a ton of holes.
The holes size, number of holes and sequence are what defines a true binary amplitude diffuser. But if all you really want is a simple perforated panel to provide some hard surface in front of a broadband absorber that looks neat, this is for you.
I started on one end of the panel and just randomly drew a sequence that was mirrored on the other end. For example the sequence for the first line is:
11100110101110101100111
the next is:
01101111010001011110110
and so on. Each is a palindrome, the same from both ends, so really you are just making the pattern on 1/4 of the panel. Very much like making a paper snowflake by folding the sheet twice and cutting the pattern.
My mistake was not making a master template panel to begin with that was accurately laid out and drilled with 1/8" pilot holes. I could then use that panel to layout the other 5 drilling the pilot holes through those to begin with before drilling the 3/4" holes. My final results would have been more accurate and I think I would have saved time overall.
These panels go on the front of broadband absorber panels and stop some of the higher frequency sound from being absorbed. Rooms with too much absorption can sound "dead", and this can fix that while still absorbing the lower frequency content. Most of the lower frequency sound just passes right through these panels and into the trap behind.

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