Slight OT: Diffuser Calculator Software - diyAudio
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Old 2nd March 2011, 08:11 PM   #1
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Default Slight OT: Diffuser Calculator Software

I know this is the loudspeaker forum, but I'm also not sure where else I can find a resource as deep and rich at that of this group.

I admit my question is off topic, but I assume if anyone knows, you guys will.

In my past wanderings on Internet, I remember coming across some software that will help calculate diffusion panels. Though I don't remember if it was an On-Line Caculator or some Downloadable Software.

Does this sound familiar to anyone, and can you direct me do some resources?

Second, there is a program that will test a room for reflections and standing waves, and so forth. I know this is a free downloadable program, and if anyone could give me the name I would appreciate it.

Sorry for the distraction, and thanks for whatever help you can give me.


Last edited by BlueWizard; 2nd March 2011 at 08:14 PM.
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Old 2nd March 2011, 09:36 PM   #2
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Join Date: Apr 2007
Try QRdude

QRDude: Quadratic Residue Diffuser calculator
Warmest regards,
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Old 3rd March 2011, 04:50 AM   #3
dewardh is offline dewardh  United States
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Or, if you want to do a PRD (skyline) there's

Calculate a Two-Dimensional Primitive Root Diffuser

and a handy prime checker (which you'll need)

Prime Number Calculator
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Old 3rd March 2011, 05:22 AM   #4
benb is offline benb  United States
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This is slightly OT to what you asked (though it's arguable that a rectangular room has nodes and standing waves just as does a rectangular speaker cabinet, the main difference being the frequencies involved - and BOTH the cabinet and the room are important to good sound reproduction!), but...

This book "The Master Handbook of Acoustics discusses how to calculate rectangular room resonances and how to calculate a diffuser, as well as many other good thing you may want to know:
I bought this book in the 3rd edition, that was of course just before the 4th came out: Master Handbook of Acoustics (9780071360975): F. Alton Everest: Books

Also, I do recall ten years ago downloading a spreadsheet that calculates the node frequencies of a room given its dimensions. I have no idea where that would be online, but I'd think there would be several of those online now.
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Old 3rd March 2011, 06:14 AM   #5
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Thanks everyone, that's all good information.

I found a copy of the Master Handbook of Acoustics for $24 in paperback; that's not too bad.

If any one has other informtion, it is certainly appreciated.

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Old 3rd March 2011, 06:46 AM   #6
dewardh is offline dewardh  United States
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Here's a primitive root calculator (for use with the prd calculator)

Section 11.4: Quadratic Residues and Primitive Roots

and for a "how to" read Lupo's posts in this thread

BBC PRD Repetition--am I allowed? -
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Old 3rd March 2011, 06:25 PM   #7
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That link to GearSlutz was in valuable. One of the posters take you completely through the design process. It is still not crystal clear, but if is far far far more clear than it was.

Thanks again to all.

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