Slight OT: Diffuser Calculator Software

BlueWizard · 08:14 PM

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.

Steve/bluewizard

Ferrit37 · 2nd March 2011, 09:36 PM

Try QRdude

QRDude: Quadratic Residue Diffuser calculator

dewardh · 3rd March 2011, 04:50 AM

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

benb · 3rd March 2011, 05:22 AM

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:
Amazon.com: 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.

BlueWizard · 3rd March 2011, 06:14 AM

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.

Steve/bluewizard

dewardh · 3rd March 2011, 06:46 AM

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? - Gearslutz.com

BlueWizard · 3rd March 2011, 06:25 PM

Dewardh.

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.

Steve/bluewizard

2nd March 2011, 08:11 PM	#1
BlueWizard diyAudio Member Join Date: Jun 2007	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. Steve/bluewizard Last edited by BlueWizard; 2nd March 2011 at 08:14 PM.

2nd March 2011, 09:36 PM	#2
Ferrit37 diyAudio Member Join Date: Apr 2007	Try QRdude QRDude: Quadratic Residue Diffuser calculator __________________ Warmest regards, Ferrit37

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3rd March 2011, 04:50 AM	#3
dewardh diyAudio Member Join Date: Dec 2005 Location: Berkeley, CA	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

3rd March 2011, 05:22 AM	#4
benb diyAudio Member Join Date: Apr 2010	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: Amazon.com: 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.

3rd March 2011, 06:14 AM	#5
BlueWizard diyAudio Member Join Date: Jun 2007	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. Steve/bluewizard

3rd March 2011, 06:46 AM	#6
dewardh diyAudio Member Join Date: Dec 2005 Location: Berkeley, CA	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? - Gearslutz.com

3rd March 2011, 06:25 PM	#7
BlueWizard diyAudio Member Join Date: Jun 2007	Dewardh. 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. Steve/bluewizard

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