Diffuser.

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darrin_h2000

darrin_h2000

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I was at the home depot yesterday and saw some fiberglass roofing material that was about 4x7' and had waves about 3" from peak to peak and had a full wave every 8" inches. it is a hard material and seems to resemble some difusers Ive seen on the net.

Im not sure of the name of the stuff but I would like to know if Its good for diffusers.
 
Sounds interesting - can you post us some pics or more info ??

cheers
John
 
I couldnt find it on the lowes website. But I found out that the peak to peak waves were 4" deep and they are made from asphalt and paper with a polymer coat on both sides.
 
Yes Darrin, some more info when you find it...

And speaking of DIY diffusers.. I found a canadian acoustic designer that builds panels using sonor tubes inside a box frame. Looks like they are cut into maybe 1/3 rounds.

Here's a link to pictures of them ( the panel are about half way down the page) By the looks, they are about 4" deep

http://home.eol.ca/~jdbsound/jdb2.html

Anybody got any thoughts on the performance of this design?
 
Well Its not Quite the same as that though I have heard of a bass trap design using those tubes.

Ill go to lowes and purchase one of thse things and remember to write down the name. I think that It will make a good diffuser for my room.

I do Plan on tracking vocals in this room as well. sort of a vocal booth/control room. would the difusers be good for the vocal booth?
 
I found pics.
 

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darrin_h2000 said:
I couldnt find it on the lowes website. But I found out that the peak to peak waves were 4" deep and they are made from asphalt and paper with a polymer coat on both sides.
Click to expand...

I would think that anything coated with a polymer seal would make it rather reflective. Diffuser design is fairly specific to the freqency you are trying to treat, so the wave design of those panels would not necessarily do what you need.

Bushice
 
Dan Merrill said:
Yes Darrin, some more info when you find it...

And speaking of DIY diffusers.. I found a canadian acoustic designer that builds panels using sonor tubes inside a box frame. Looks like they are cut into maybe 1/3 rounds.

Here's a link to pictures of them ( the panel are about half way down the page) By the looks, they are about 4" deep

http://home.eol.ca/~jdbsound/jdb2.html

Anybody got any thoughts on the performance of this design?
Click to expand...

Any idea what's inside those PPD panels? That guy seems to know what he's doing. Be nice to see a string of pics showing the entire manufacturing process of them. They sell them for $139-300 bucks. Here's a more specific link:

http://www.jdbsound.com/art/noisebut.htm
 
I thought a diffuser was for breaking up echos and having ambiance with out slap back echo.
 
Bushice said:


Any idea what's inside those PPD panels? That guy seems to know what he's doing. Be nice to see a string of pics showing the entire manufacturing process of them. They sell them for $139-300 bucks. Here's a more specific link:

http://www.jdbsound.com/art/noisebut.htm
Click to expand...


there's some cool concepts to be learned from this guys website about room acoustics..

I would guess there's some fiberboard being used in there. And judging by the limited "in progress" pictures on the link.. the backs are particle board or plywood, the sides look solid too, so that begs another question: what's on the front causing the diffusion above 800hz, (it can't be just curved fiberboard, that would absorb the highs)

Since he sells the stuff, we probably won't get a DIY photo shoot from him!
 
darrin_h2000 said:
I thought a diffuser was for breaking up echos and having ambiance with out slap back echo.
Click to expand...

My Bad. I was thinking of slot resonators.

Bushice
 
Dan Merrill said:



there's some cool concepts to be learned from this guys website about room acoustics..

I would guess there's some fiberboard being used in there. And judging by the limited "in progress" pictures on the link.. the backs are particle board or plywood, the sides look solid too, so that begs another question: what's on the front causing the diffusion above 800hz, (it can't be just curved fiberboard, that would absorb the highs)

Since he sells the stuff, we probably won't get a DIY photo shoot from him!
Click to expand...

yeah, I agree. Have you got $139 bucks to spare, so you can buy one and take it apart :)
 
Dug this out of that website concernng the materials in these panels:

"In making these panels, we made a material change in the internal parts of the panels. These changes were not tested but the test data from the manufacturer of the fiberous materials indicated that we were working with a better product, but how much better, we could only calculate and hope we were right. "

So, looks like fiberboard, or the likes, on the inside.

The final Jeopardy question today is: what is on the front face?
Is this a solid front, panel absorber, or a helmholtz with maybe a pegboard face on the front? they claimed diffusion at roughly 800hz and above. You have 45 seconds to answer :-)
 
darrin,

These just look like a designer twist on old fashioned corrugated roofing.

I would avoid anything with a sinusoidal pattern like this. You're libel to get sharp reflections or cancellations at specific wavelengths and angles. Well engineered diffusers often have their designs based on things like prime number sequences which is sort of the opposite of a linear sine wave.

You're better off going to the scrap yard and finding random pieces of whatever to cover your walls with - as long as it doesn't resonate or rattle.

barefoot
 
Garret said:
This is a new design...the function will be similar.
Click to expand...

No, it's not. In fact it's not even remotely related to the eight year old conversation you resurrected in a none too subtle attempt to spam us with your link.

kthxbye.
 
:laughings:

thought you were talkin to yerself again Stratley. :p

musta got the b&
 

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