Making easy DIY "Depot" sound Diffuser panels, step by step
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emailtim
diyAudio Member

Join Date: May 2005
Location: USA
Quote:
 Originally Posted by bwaslo They are exactly the multiples of the given wood dimensions. The model was optimized restricting to such dimensions. I think the AFMG screen of this one is the attached (not sure, but it's at least a close one) It is not a mathematically derived type diffusor like an MLS or RPG type, it is an empirically optimized/analyzed type (which can be just as effective, by the way).
What I can glean from the bits and pieces, the LeanFuser is a factor of 5 equal units high, each unit being 10 mm (of which they only use levels 0, 3, 4 and 5). Tim mentioned to make the imperial version of the LeanFuser, it would be acceptable to use 1/2" (approx 12.5mm) and that it actually worked better than the metric 10mm version.

Your version appears to be approximately 2X the LeanFuser unit height (or 2 x 10mm) given the available material depths (with a different height sequence).

LeanFuser - Yours (calculated from selected material)
50mm - 98.4mm (1.5" + .3" + (3 x .7"))
40mm - 80.9mm (1.5" + .3" + (2 x .7"))
30mm - 63.3mm (1.5" + .3" + (1 x .7"))
none - 45.7mm (1.5" + .3")
none - none
0mm - 0mm

Is this the correct interpretation (scaled by a unit factor of 2 and different height sequence) ?

LeanFuser Height Unit Sequence - 0, 4, 5, 3, 5, 4, 0
Your Height Unit Sequence - 0, 2, 3, 4, 2, 5, 0, 0, 5, 2, 4, 3, 2, 0

TIA

P.S. Debating on trying this one or a QRDude painted EPS version to experiment with.

Last edited by emailtim; 10th July 2017 at 11:53 PM.

MFagains
diyAudio Member

Join Date: Jul 2017
Quote:
 Originally Posted by emailtim The Diffuser Fabrication document stated that when repeating the pattern, the mounting depth needs to be varied to avoid "periodicity" (which I would assume to be similar to a comb filter effect). The center one could be slightly raised more than the flanking 2.]
Hello All;
being that I only have room for 2 diffusers, will "periodicity" be an issue with them side by side?

Thanks

MF

 25th July 2017, 06:10 AM #123 bwaslo   Old guy with soldering iron diyAudio Member     Join Date: May 2006 Location: Portland, Oregon! make them not be the same distance from the listening chair or from either speaker __________________ [W9MJE] Horn spreadsheet SynergyCalc/; SmallSyns SmallSyns; Crossover design Xsim; Depot diffusor super-easy diffusors
 25th July 2017, 04:52 PM #124 MFagains   diyAudio Member   Join Date: Jul 2017 Thank you Sir.....
Cambe
diyAudio Member

Join Date: Aug 2001
Location: USA,NorthCarolina
bwaslo,
My friend Irshad and I recently completed a pair of diffusers based on your design. We both are very impressed with the outcome of this project.
Thank you for sharing this with us.
I have attached pictures of the diffusers in Irshads listening room of the front and back walls. If their any other suggestions or improvements we can make let us know.
Attached Images
 IMG_0028.jpg (73.8 KB, 278 views) IMG_0033.jpg (75.5 KB, 274 views)

Last edited by Cambe; 21st November 2017 at 09:14 PM.

 21st November 2017, 09:17 PM #126 Cambe diyAudio Member   Join Date: Aug 2001 Location: USA,NorthCarolina Sorry, I don't know why the pictures came out upside down.
 22nd November 2017, 01:37 AM #127 bwaslo   Old guy with soldering iron diyAudio Member     Join Date: May 2006 Location: Portland, Oregon! Thanks Cambe. Those look nice in there, looks like a good room. __________________ [W9MJE] Horn spreadsheet SynergyCalc/; SmallSyns SmallSyns; Crossover design Xsim; Depot diffusor super-easy diffusors
 15th December 2017, 11:05 PM #128 rickmcinnis   diyAudio Member   Join Date: Jun 2006 Finally going to make some of these. I need to hang them so I will hear how the 2 inch foam board works. I would like to use the same size board for everything - instead of the plywood on furring strips a 12.7 x 96 inches piece and the other pieces using 2.34 x 96 inches but using the two inches thick material. Would this extra depth upset everything? __________________ Rick McInnis
 15th December 2017, 11:28 PM #129 bwaslo   Old guy with soldering iron diyAudio Member     Join Date: May 2006 Location: Portland, Oregon! Don't know. Probably not a problem, is my guess (just a guess though) __________________ [W9MJE] Horn spreadsheet SynergyCalc/; SmallSyns SmallSyns; Crossover design Xsim; Depot diffusor super-easy diffusors
 20th December 2017, 05:07 PM #130 straight8s   diyAudio Member   Join Date: Apr 2017 Great tutorial, thanks for sharing your methods.

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