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Making easy DIY "Depot" sound Diffuser panels, step by step
Making easy DIY "Depot" sound Diffuser panels, step by step
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Old 20th November 2019, 04:00 PM   #151
Retsel is offline Retsel  United States
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First, thanks to Bwaslo for designing these and sharing the construction technique. I am building four of these for my back wall. I have started to build them and then stopped my construction as I ponder an adjustment to their construction.

There is some empty space behind the outside plywood piece which supports the furring strips which form the diffuser steps. This empty space is created by the two 1 x 2 wooden pieces which supports either end of the outside plywood pieces. If one 1 x 2 piece is moved inward towards the center of that outside plywood piece, it would make a horizontal space which would add to the diffuser "depth." The potential downside to the horizontal space is that the absorption would be greater than the vertical wells. But it would be interesting to at least model the effect that a horizontal well could have on the diffuser performance. I hope to get the model working to see if I can model this change, and figure out how deep the horizontal wells should be for best performance.

Just one construction idea that I used. For half of the 1 x 3 pieces I used rough furring strips, but for the pieces facing the outside, I used finished pieces so that the outside face of the diffuser would have a nicer appearance. The downside of this approach is that the rough 1 x 3 pieces are a little wider than the finished ones. I started out sanding the wider pieces down, but this was going to take forever, so I ripped them using a table saw and that worked good, and then I touched them up with some finish sandpaper to smooth out the finish of the table saw cuts.

Retsel
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Old 20th November 2019, 05:53 PM   #152
carlthess40 is online now carlthess40  United States
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Where’s a build list and so one?
Is it better to use hard or soft wood?
I love ceded and Cyprus and wood with a lot of reds in them and with a ruff cut to them
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Old 20th November 2019, 06:05 PM   #153
Retsel is offline Retsel  United States
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The very first post contains the list of building materials and a diagram of how to put them together.

I should also note that I am gluing and screwing everything together with these diffusers to prevent this thing from singing like a canary when the sound levels are higher in the room.

One more note, since I am coupling multiple diffuser panels together for my back wall, the height of each diffuser panel should be different to improve the diffusion properties of multiple diffusers.

Here is another website where diffuser ideas are discussed, and the original designer of these 1D diffusers, Tim Perry, regularly posts to this site.

DIY Sound Diffusers—Free Blueprints—Slim, Optimized DIY Diffuser Designs (+Fractals) - Page 16 - Gearslutz
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Old 20th November 2019, 06:15 PM   #154
carlthess40 is online now carlthess40  United States
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Thanks a lot. Great job
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Old 9th January 2020, 01:26 PM   #155
audiobox is offline audiobox
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Quote:
I should also note that I am gluing and screwing everything together with these diffusers to prevent this thing from singing like a canary when the sound levels are higher in the room.

One more note, since I am coupling multiple diffuser panels together for my back wall, the height of each diffuser panel should be different to improve the diffusion properties of multiple diffusers.
I remodeled a dining room into a recording room so I also glued & screwed since high SPLs would be a given. I was concerned about possible cavity resonance, so I filled them with mineral wool. Since I had multiple modules, I too varied the height as per your linked article.
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Old 15th January 2020, 11:13 PM   #156
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by audiobox View Post
I was concerned about possible cavity resonance, so I filled them with mineral wool.
You've turn a diffuser into an absorber, entirely different thing
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Old 15th January 2020, 11:33 PM   #157
audiobox is offline audiobox
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Originally Posted by scottjoplin View Post
You've turn a diffuser into an absorber, entirely different thing

Perhaps. However, I believe the diffusion is generated by the topography of the hard surface. Those very shallow, narrow cavities wouldn't perform very well as membrane absorbers.
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Old 16th January 2020, 01:04 AM   #158
bwaslo is offline bwaslo  United States
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Making easy DIY "Depot" sound Diffuser panels, step by step
Right. The inside space is just to save materials (and weight), the outside surface is what does the diffusing. Filling the void with fluff shouldn't hurt anything thoug I doubt it would really be much of an issue for resonances (I've not noticed anything). But not a lot of effort so might be a safer way to go.
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Old 16th January 2020, 02:32 AM   #159
jameshillj is online now jameshillj  Australia
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To reduce the weight (and cost) I made some out of high density styrene foam (same as used on the outside of houses) and glued the profiled shapes to 12mm ply and built the basic 7 segment arrays (with the offsets) on a steel frame - this is used on the wall of a band practice studio and the higher volume does make the structure vibrate quite noticeably - I then added some extra bracing and some heavy leaded vinyl to the back ply surfaces that deadened the vibration but doesn't seem to effect the behavior of the diffusors at all.

Out of interest, I cut some styrene profiles to accommodate an added 3mm thick plywood strips glued on the front flats and this certainly increased the diffusion - no doubt, even with a few heavy coats of paint, the simple styrene units still absorbed some energy.

I increased the 'flats' on the styrene profile to suit the 63mm slats of the venetian blinds (7 x 63 = 441mm, up from 420 per module) with no perceived difference - same thing with the plastic slats.
With the 12mm ply as the rear support surface per section and steel tube supports, it's a reasonable, lighter compromise, but a lot more 'stuffing around'.
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