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R/E/P => R/E/P Archives => Reason In Audio => Topic started by: rdolmat on September 27, 2005, 11:59:05 am

Title: D.I.Y. Diffusers
Post by: rdolmat on September 27, 2005, 11:59:05 am
Hi all!

Anyone have good tips or suggestions on DIY diffusers? I'd like to throw some up on my rear wall but don't want to pay $150 for 1 molded plastic tile!! What a rip-off!

Maybe a good junk store has some weird looking tile thing that can be a diffuser? Cool
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on September 27, 2005, 12:12:00 pm
You can certainly make your own, but to work properly they must be built according to certain acoustic principles related to the laws of physics as they relate to sound waves (remember science?  some here seem to be ignoring it).

Surely someone here knows of a good book whioch relates such things.

Egg cartons won't do it.


http://www.acousticsfirst.com/articles/diskmakers/index.htm
Title: Re: D.I.Y. Diffusers
Post by: Eric Bridenbaker on September 27, 2005, 12:27:50 pm
compasspnt wrote on Tue, 27 September 2005 12:12

You can certainly make your own, but to work properly they must be built according to certain acoustic principles related to the laws of physics as they relate to sound waves (remember science?  some here seem to be ignoring it).

Surely someone here knows of a good book whioch relates such things.

Egg cartons won't do it.


http://www.acousticsfirst.com/articles/diskmakers/index.htm

The hard part is to get the diffusion to happen evenly across the spectrum. Overly symmetrical patterns will tend to favor only a certain set of frequencies, breaking up/randomizing the physical pattern of the diffuser helps a lot.

Bookcases (filled with books) tend to have nice diffusion properties.

Check out the RPG site for ideas on how they approach their designs, and also some of the math that goes into creating even sound redistribution:

http://www.rpginc.com/proaudio/index.htm

Also here:

http://www.audioholics.com/techtips/roomacoustics/RPGdiffuse rs.php

Of course, every case is different, a good acoustician will be able to let you know if you're on the rght track.

Best,
Eric
Title: Re: D.I.Y. Diffusers
Post by: blairl on September 27, 2005, 12:29:48 pm
rdolmat wrote on Tue, 27 September 2005 09:59

Anyone have good tips or suggestions on DIY diffusers? I'd like to throw some up on my rear wall but don't want to pay $150 for 1 molded plastic tile!! What a rip-off!


I don't think you are taking the R&D into consideration.  Properly designed diffusors are not some kind of randomly placed protrusions.  There is a science behind the funny shapes.  If you are serious about making your own, there is a book that can point you in the right direction.  It's a text book with lots of science and math.  

Acoustic Absorbers and Diffusers

You'll have to weigh the time/effort/cost question between finding out how to build your own and doing it vs. going out and paying for pre-manufactured diffursors.
Title: Re: D.I.Y. Diffusers
Post by: Frob on September 27, 2005, 03:35:18 pm
the easy est way to DIY it is to buy one and make a mold and then build them from the mold.
Title: Re: D.I.Y. Diffusers
Post by: eightyeightkeys on September 27, 2005, 04:04:35 pm
If it's a small room then diffusors won't help as much as absorbers. What size of room is it ?
Title: Re: D.I.Y. Diffusers
Post by: Norwood on September 27, 2005, 04:16:15 pm
Frob wrote on Tue, 27 September 2005 12:35

the easy est way to DIY it is to buy one and make a mold and then build them from the mold.


Do you work for Behringer?!? Shocked
Title: Re: D.I.Y. Diffusers
Post by: redfro on September 27, 2005, 05:27:41 pm
Norwood wrote on Tue, 27 September 2005 15:16

Frob wrote on Tue, 27 September 2005 12:35

the easy est way to DIY it is to buy one and make a mold and then build them from the mold.


Do you work for Behringer?!? Shocked


LMFBO!!
Title: Re: D.I.Y. Diffusers
Post by: Bill Mueller on September 27, 2005, 06:51:18 pm
Rich,

Very simple, very effective and very cheap diffusors are also some of the oldest designs, dating back fifty years or more. I have seen these for years in top recording studios and film houses. They do not look like what you would consider a diffusor however, but when used properly, they work very well at both diffusion and low frequency absorption. A good book to read is F. Alton Everest's book on Building a Recording Studio. Good stuff in there.

Ok, the structures I am talking about are called polycylinders. I have made these things for thirty years. The simplest way to make them is to mount verticle strips of 1"X3"X8' oak, 44" apart, to the wall with heavy duty wall anchors. I like to make a length wise cut in the strips creating a V between the strip and the wall to capture the panel. Then take a 1/8" X4'X8' Oak Luan panel (I like to finish them with Polyurethene) and wedge it between the verticle strips. It will bow out a few inches from the wall and create a nice poly surface. If you make the distance between the strips shorter, the bow will be deeper and it will be a bit harder to get them in, but I find it is better to slightly vary each one so they don't all resonate at the same frequency.

Because they resonate, they also act as a bass trap. You can calculate the exact F0 if you buy the book but I find them to be very effective bass traps no matter what spacing is between the strips. I further recommend that you staple raw fiberglass to the wall in between the strips. It will add absorption and effectiveness to the unit and of course will be invisible after the panels are up.

I usually mount them about 24" up the wall from the floor. This uses up less floor space, does not cover the AC outlets and gives you a convenient place to store your guitar amps. If you ceiling is not 10' then cut them down to 6' height.

If you have a large recording room, stagger them on either side of the parallel walls. You probably don't need them on both walls and they are very effective at breaking up standing waves. In a control room I put one dead center on the back wall with one or two on either side, depending of course on the width of the room. I also like to place them on the rear side walls to create a "live" end of the room. They are great for adding a live component to a Reflection Free Zone design.

They are very easy to take down when you move, and don't permanently damage the wall. They also look stunning and can give a very professional flavor to a room.

For the rest of the room, (front wall and side walls back a foot or two past the listening position) I recommend absorptive panels like Ethans RealTraps.

Hope this is helpful.

Best Regards,

Bill
Title: Re: D.I.Y. Diffusers
Post by: Bryson on September 28, 2005, 05:21:30 am
Bill Mueller wrote on Tue, 27 September 2005 15:51

Rich,

Very simple, very effective and very cheap diffusors are also some of the oldest designs, dating back fifty years or more.

More like the Romans were using them.

Here're some poly types that I made.
They have a 4' wide pegboard face curved to a 7.5" max depth, covered with Guilford FR701 fabric. Under the fabric is a layer of poly batting to keep the peg holes from showing on the surface. Behind the pegboard is .5" foam to contain the loosely placed fiberglass batts inside. I have one over the mix position, and one on the wall behind me.

index.php/fa/1629/0/
Title: Re: D.I.Y. Diffusers
Post by: rdolmat on September 28, 2005, 03:45:01 pm
Thanks everyone! Always a ton of help here!  Smile

Those poly round diffusers were the ones I was thinking about. I'm not going to try to make the block type with various heights of square pegs.

I'll give those a shot. They seem pretty simple. Yes, I know they probably won't work as well as the uber-expensive ones, but I'm willing to give it a try first.

If they dont work, then pull out the VISA!

thanks again!

cheers
rich
Title: Re: D.I.Y. Diffusers
Post by: micguy on September 29, 2005, 04:31:23 pm
My organic diffusers are literally home-grown - Mother in Law's tongue (a plant that anyone can grow) is a really good natural diffuser - put 'em in the path of reflections you want to kill, and they diffuse them pretty well. Plus they give off oxygen.
Title: Re: D.I.Y. Diffusers
Post by: joeq on September 29, 2005, 05:10:09 pm
blairl wrote on Tue, 27 September 2005 12:29



I don't think you are taking the R&D into consideration.  Properly designed diffusors are not some kind of randomly placed protrusions.  There is a science behind the funny shapes.  


Those $150 pieces of plastic are one of my pet peeves.

I can appreciate the R&D and science and the quadratic roots and all that,  but one still has to ask at what point have these R&D costs been amortized?  ("Dammit Johnson!  When are you people in Diffusion going to start showing a profit??")

I have held some of these things in my hand.   Once you have designed such a panel the cost of manufacture has got to be something like two bucks.        

You would think that at least ONE acoustics company would opt for volume sales over high prices and blow everybody else out of the water.

If they were $15 apiece I would buy 10.   The company would take in $120 instead of $148.   Not too bad when you consider that they never get the $148 because I refuse to pay $150 for one lousy diffusor.
 
Title: Re: D.I.Y. Diffusers
Post by: BR audio on September 30, 2005, 01:45:41 pm
Hey there,
I'm in the process of building some diffusors for a studio and I have to tell you that it is not as cheap as you think.  Even if the R&D is done for you.  I was doing the math on the QRDs from RPG and they would cost me in parts (wood, paint and stuff) about $350 to $400 each.  That is not including labor.  So I actually started to think that what they are chargin is not as horrendous as I originally thought.  Even though they are producing them in greater quantities.
The problems with home made diffusors such as bamboos, plants, books in big book case and other objects, is the fact that you can't have any accuracy on what frequencies they are affecting.  Not to say that it won't work, but it is just harder if not impossible to taylor them to your room's need.

I saw a repply that mentioned that you also need to consider your room size, and I agree.  If your room is too small (bedroom size), you will be better of worring about absorption.  The biggest problems with smaller rooms are in the low frequency range.  Anywhere below 200hz.  I would recomend taking care of room modes in that area before worrying about diffusion.

If you trying to stay in budget, don't even think about QRDs or Diffractals.  Maybe the polys are your best choice..

my2cents

Very Happy Gil
Title: Re: D.I.Y. Diffusers
Post by: Bill B on September 30, 2005, 07:48:56 pm
rdolmat wrote on Tue, 27 September 2005 11:59

Hi all!

Anyone have good tips or suggestions on DIY diffusers?



I built some 'skyline' diffusors using the prime number theory posted on the BBC website. As you build more of these they fit togother to create a bigger diffuser, kind of a fractal thing. Here's a pic: (I hope)
Title: Re: D.I.Y. Diffusers
Post by: Bill B on September 30, 2005, 07:50:20 pm
WOW! Sorry bout the file size- I grabbed the wrong one, damn!
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on September 30, 2005, 09:44:19 pm
Hey Bill, it's so small I can "bear-ly" see it!

Seriously, is that blocks of compact foam, glued together?
Title: Re: D.I.Y. Diffusers
Post by: Bill B on September 30, 2005, 11:15:12 pm
har har. I barely got it!
It's built from 1"x 1"x 3/4" blocks of cedar, which is light and easy to work with. I just set up the table saw and had a little cut fest. I thought foam would be too unstable, and probably have to be painted with a gloss to cut down on it's absorbency. The BBC notes suggested square pvc tubing, but I thought that was a little too reflective. In the pic the rough construction was sprayed with a textured paint, but I found that if you do a neat enough job, the plain cedar looks nice and fits just about any rooms' color scheme, being a natural looking element. The variations in the woods' color is nice, and you can use the rough sawn side if you want more texture and possibly 'micro diffusion'.
Total materials per 'unit' (unit=4 12"x 12" sections)is about $14.00. There is no scientific calculation to the unit size, I just figured it had to be at least that large to have a noticeable effect.
Title: Re: D.I.Y. Diffusers
Post by: Bill B on September 30, 2005, 11:21:02 pm
Bryson wrote on Wed, 28 September 2005 05:21


More like the Romans were using them.

Here're some poly types that I made.


Do you also have the fabric on the walls and ceiling, or is that a good paint match?
Title: Re: D.I.Y. Diffusers
Post by: 12345 on October 01, 2005, 12:33:39 am
I also find that covering the diffusor with a stainless steel mesh (such as they use over microphone capsules) helps the process.  Just make sure to ground the mesh, as if it's not grounded it will act like an antenna.

MW
Title: Re: D.I.Y. Diffusers
Post by: lord on October 01, 2005, 10:03:15 am
Should I be grounding my mic stands too?

My god. What about the cymbals?
Title: Re: D.I.Y. Diffusers
Post by: rdolmat on October 01, 2005, 10:44:45 am
badbear wrote on Fri, 30 September 2005 20:15

har har. I barely got it!
It's built from 1"x 1"x 3/4" blocks of cedar, which is light and easy to work with. I just set up the table saw and had a little cut fest. I thought foam would be too unstable, and probably have to be painted with a gloss to cut down on it's absorbency. The BBC notes suggested square pvc tubing, but I thought that was a little too reflective. In the pic the rough construction was sprayed with a textured paint, but I found that if you do a neat enough job, the plain cedar looks nice and fits just about any rooms' color scheme, being a natural looking element. The variations in the woods' color is nice, and you can use the rough sawn side if you want more texture and possibly 'micro diffusion'.
Total materials per 'unit' (unit=4 12"x 12" sections)is about $14.00. There is no scientific calculation to the unit size, I just figured it had to be at least that large to have a noticeable effect.


Hi Bill!

Those look great! I think I have to pull our my saw and a coffee!!
Title: Re: D.I.Y. Diffusers
Post by: Tomas Danko on October 02, 2005, 12:07:07 pm
Oh boy do I feel stupid now when I sit here and look at all them egg cartons I put on every wall as well as the ceiling and floor.

And I had been telling my friends I got the same acoustics here as they do at the Fraunhofer Institute.

This is even worse than the allergic reaction I developed towards yokes, having had eggs for breakfast, lunch and dinner the last two months.
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on October 02, 2005, 12:32:06 pm
Pretty good "yoke," Tomas!
Title: Re: D.I.Y. Diffusers
Post by: jimmyjazz on October 03, 2005, 10:20:51 am
What does one of your 12" x 12" "units" weigh?  How did you hang them?
Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 03, 2005, 05:43:48 pm
Glues onto a backing 'plate' of 1/4" birch plywood, total weight might be a pound and a half. The plywood weighs about as much as all the cedar blocks. They're light enough to hang with adhesive, but I used stainless countersunk screws into drywall anchors. I used stainless because the tanins in cedar can corrode a zinc or steel screw over time.
I also sprayed the plain cedar diffusors with a satin laquer to make them easier to clean and give them a more finished look. Use Deft brand if you can find it, it has a nice, buttery, warm look to it. I think Lowe's carries it.
I'm going to try some colored water-based stains on my next ones.
Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 03, 2005, 05:47:56 pm
Another note: Once you see the graph for the layout, you can build faster using different sized blocks. The ones in the picture were made from all 1" blocks, which isn't necessary if you plan ahead.
You could also use the wood diffuser for a reverse mold and cast a   fiberglass 'master' for making more 'glass units.
Title: Re: D.I.Y. Diffusers
Post by: jimmyjazz on October 04, 2005, 10:24:05 am
Great info.  Thanks.

I'd bet the effort of creating fiberglass versions using the wood as a master would be more trouble than it would be worth.  Just make more wood copies.  I agree that cutting the individual blocks to length as opposed to stacking 1" blocks makes tons of sense.  You just need the recipe ahead of time.

What's the frequency range of your diffusors?  How deep into the bass region do they extend?

I had been toying with a very similar construction approach, but planned on using machine screws into stainless inserts (keenserts, etc.) sunk into balsa wood.  I hadn't even considered cedar.  A natural finish on cedar would add a nice "studio" touch . . . you know, all studios have to be chock full of wood, right?
Title: Re: D.I.Y. Diffusers
Post by: zetterstroem on October 04, 2005, 12:31:55 pm
badbear wrote on Sat, 01 October 2005 01:48

rdolmat wrote on Tue, 27 September 2005 11:59

Hi all!

Anyone have good tips or suggestions on DIY diffusers?



I built some 'skyline' diffusors using the prime number theory posted on the BBC website. As you build more of these they fit togother to create a bigger diffuser, kind of a fractal thing. Here's a pic: (I hope)



do you have a link??
Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 04, 2005, 01:14:16 pm
zetterstroem wrote on Tue, 04 October 2005 12:31


do you have a link??



http://www.bbc.co.uk/rd/pubs/reports/1995-01.pdf

Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 04, 2005, 01:19:30 pm
jimmyjazz wrote on Tue, 04 October 2005 10:24

What's the frequency range of your diffusors?  How deep into the bass region do they extend?


I haven't done any serious testing yet (still building my new room) but I thought I read in the BBC R&D report that they worked down to around 800Hz. I don't know how much lower diffusion would be useful, but at some point I'm sure there's a diminishing return.
Title: Re: D.I.Y. Diffusers
Post by: jimmyjazz on October 04, 2005, 01:26:54 pm
http://www.bbc.co.uk/rd/pubs/reports/1990-15.pdf

is referenced in badbear's paper.  I haven't dug into it yet, but it appears to describe the theory of diffusers in some detail.
Title: Re: D.I.Y. Diffusers
Post by: bounce on October 04, 2005, 04:19:25 pm
Hi. I layed out the measurement grid from the BBC doc if anyone wants to build these "block" style diffusors. Here's the grid (height ratio of blocks):

0 3 4 1 2 3 3 1 4 2 3 3
3 0 1 4 2 1 1 3 3 2 1 1
3 1 1 3 1 3 2 2 1 0 2 2
2 2 2 2 0 4 3 2 3 2 1 1
3 3 1 1 3 1 1 3 4 3 1 3
2 3 2 1 2 0 3 2 4 2 1 0
2 3 2 1 3 1 2 2 3 1 3 4
2 0 2 4 4 0 1 2 1 4 2 2
3 4 1 0 1 3 3 1 0 2 3 3
1 3 3 1 2 4 1 2 0 1 3 1
2 1 2 3 1 3 3 2 4 2 3 4
2 4 2 3 3 1 1 2 0 3 1 0

And here's a list of how many of each length block you will need when precutting the wood:

Count of number:

number   Total pieces of this length (height actually) of wood

0   13 (no cuts here if you're going flush with the surface)
1   38
2   38
3   40
4   15

Grand Total   144 pieces (131 if 0's aren't used)

I assume these will work with 1x1 or 2x2 inch squares (cut longer depending on the graph number- ie. graph designating number 3 would mean use a 1x3 inch block or 2x6 if using 2x2's)...I'll have to break out the saw!

mckay
Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 04, 2005, 05:24:20 pm
I considered making some from 2x2's as well. They would wiegh more,  but diffuse more surface area per unit.
Title: Re: D.I.Y. Diffusers
Post by: Ivo on October 05, 2005, 04:08:10 pm
Just fixed them yesterday ...

http://www.savita.cz/show/di7.jpg

http://www.savita.cz/show/di6.jpg

http://www.savita.cz/show/di5.jpg

http://www.savita.cz/show/di4.jpg

http://www.savita.cz/show/di3.jpg

http://www.savita.cz/show/di2.jpg

http://www.savita.cz/show/di1.jpg

http://www.savita.cz/show/di9.jpg
Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 06, 2005, 08:58:27 pm
Ivo, those look great. Are they from a kit?
Title: Re: D.I.Y. Diffusers
Post by: Ivo on October 07, 2005, 02:21:54 am
There are DIY (or rather LCDI = let a carpenter do it Smile ) exactly according to Schroder algorithms (in two sizes). 140x70 and 90x45. They are more or less the same as RPG diffusers at a fraction of cost ...
I already tried to play violin there, sounds very nice, full and spacy ...
You can also notice huge "superchunk" corner absorbers (DIY )

No I would like to add some cylimndrical polydiffusers on the side walls, but rather simple wooden ones
Title: Re: D.I.Y. Diffusers
Post by: Bill B on October 07, 2005, 09:54:50 am
Any chance you could share the plans with us?
Title: Re: D.I.Y. Diffusers
Post by: Ivo on October 07, 2005, 12:15:46 pm
There is no secret in it. Just two selected Schroder algrorithms:

1)
11 wells
Well width 6 cm
Well depths:
2,8,18,10,6, 6, 10, 18, 8, 2, 0  cm
about 1 cm ribs in between each well

Size 70x140cm

2) 7 wells
Well width 5,7 cm
Well depths:
3,12,6,6,12,3, 0 cm

Size 45x90 cm

Now I am looking for some tips (and photos) for simple cylindrical polydiffusers
Title: Re: D.I.Y. Diffusers
Post by: Bryson on October 07, 2005, 02:59:27 pm
http://www.decware.com/p1324.htm
http://www.decware.com/p1312.htm

http://www.diffusor.com/English/Index2.htm

http://www.orionsound.com/diffuser_array.htm

http://www.johnlsayers.com/phpBB2/viewtopic.php?t=1637

http://www.acoustics.salford.ac.uk/research/arc_cox_projects .htm
Title: Re: D.I.Y. Diffusers
Post by: stuntbutt on October 08, 2005, 08:08:27 pm
Does anyone know if the well dividers are necessary in a quadratic residue diffuser?  I've seen big ones without the dividers.  We are talking well widths of over a foot and depths out to 2 feet.  All the more normal scaled ones I've seen have had the well dividers.  I'm wondering because I have an idea for simple construction that does not include well dividers.
-------------------------------------------------
John Katsafanas
Title: Re: D.I.Y. Diffusers
Post by: Ivo on October 09, 2005, 02:40:01 am
I have read that the well dividers are quite necessary to avoid phase problems when the sound addresses the diffuser from the side.
Title: Re: D.I.Y. Diffusers
Post by: stuntbutt on October 09, 2005, 02:57:13 am
Thanks Ivo.  Congratulations on your room.
Title: Re: D.I.Y. Diffusers
Post by: Ivo on October 09, 2005, 06:33:26 am
Now I plan to make few big cylindrical polydiffusors on the side walls (just simple slightly curved plywood on the frame). I wonder - what acoustic difference does it make to add some rockwool layer on the bent plywood from inside or to keep it simply plain? Or to put rockwool inside the frame on the wall ? Just to bend the plain plywood would be the easiest of course ...
The main purpose would be to erase the flutter between the side walls without too much "deadenig" the room.
Title: Re: D.I.Y. Diffusers
Post by: matucha on October 09, 2005, 07:37:04 am
Wow, Ivo is becoming DIY acoustic "specialist", congrats Wink.

There is a link at the johnlsayers.com forum to xls calculator, that calculates room modes etc... and it also calculates shroeder diffusor parameters. It gives you idea what freq. range will be diffused so you can "design" it to fit your needs.
Title: Re: D.I.Y. Diffusers
Post by: Craig Patterson on October 10, 2005, 11:13:20 am
Here's a link to the ones I built, which also has links to the BBC site, and the formula that was used to calculate the piece sizes.  There's no way these should cost anyone $350 to build.  They should cost less than twenty bucks, and they weigh 23 pounds apiece.

-Craig

http://www.pmerecords.com/Diffusor.cfm
Title: Re: D.I.Y. Diffusers
Post by: blairl on October 10, 2005, 02:33:30 pm
Ivo wrote on Sun, 09 October 2005 04:33

what acoustic difference does it make to add some rockwool layer on the bent plywood from inside or to keep it simply plain? Or to put rockwool inside the frame on the wall ? Just to bend the plain plywood would be the easiest of course ...


The bent plywood will resonate at a specific frequency.  The rockwool or fiberglass will absorb this resonance.  The more rockwool you put inside, the broader the bandwidth of absorption will be but the lower the peak will be.  In short, you do want rockwool inside the polydyndrical diffusors.  I would put them on the wall insdide and not on the back of the bent plywood.  This should allow for the plywood to resonate more freely, which is good, and the rockwool on the wall behind the plywood will absorb or "trap" the resonance.
Title: Re: D.I.Y. Diffusers
Post by: WaveGuide on December 09, 2007, 04:28:13 pm
For anyone looking for Diffusers like the one's discussed in these previous posts and does not want to mess with DIY, I might have a solution for you.

http://www.waveguideacousticsolutions.com

Made from a hard closed cell 2.5# foam and mounted to 3/8" plywood and then coated in multiple layers of flat latex paint. These units have been raved about by those that use them.
index.php/fa/6913/0/
Title: Re: D.I.Y. Diffusers
Post by: Mathieu Delquignies on March 04, 2008, 08:25:55 am
It's not DIY but an interresting product, environmentally progressive, aesthetic and affordable design :

http://www.mioculture.com/store/pc/viewPrd.asp?idcategory=2& amp;idproduct=9

I thought it makes not more than egg boxes, but maybe fill in with some material like foam ?...

Is anybody already try it ?
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on March 04, 2008, 10:07:26 am
Mathieu Delquignies wrote on Tue, 04 March 2008 08:25

It's not DIY but an interresting product, environmentally progressive, aesthetic and affordable design :

  http://www.mioculture.com/store/pc/viewPrd.asp?idcategory=2& amp; amp; amp;idproduct=9

I thought it makes not more than egg boxes, but maybe fill in with some material like foam ?...

Is anybody already try it ?



These look really nice, and are ertainly cost effective.  What I do not see on their site is any documentation related to effect upon low freq's, nor any mention of fire safety.

Egg cartons, of course, are highly useless because of those two factors.  Really nothing done below 500.

Here is some egg information:


index.php/fa/7952/0/
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on March 04, 2008, 10:09:17 am
index.php/fa/7953/0/
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on March 04, 2008, 10:14:12 am
index.php/fa/7954/0/
Title: Re: D.I.Y. Diffusers
Post by: compasspnt on March 04, 2008, 10:16:02 am
index.php/fa/7955/0/
Title: Re: D.I.Y. Diffusers
Post by: Steve Hudson on March 04, 2008, 01:01:37 pm
Bruce Maddocks designed some nifty parabolic diffusors to attach to the front of some Helmholtz resonators he also designed for a previous studio of mine. In concert with the RPG array in the middle, we liked the results.

index.php/fa/7957/0/
Title: Re: D.I.Y. Diffusers
Post by: 0dbfs on April 01, 2008, 11:32:11 am
Howdy,
This is a great thread. I was planning to do poly's but it looks like the DIY skylines aren't too bad after all.

Thanks for the info everyone!

Cheers,
j
Title: Re: D.I.Y. Diffusers
Post by: Hallams on August 20, 2008, 01:53:06 am
Here is a pic of the diffuser I helped put up in a mates  mix room.
The design measurements etc were done by Graham Thirkle who also designed the room dimensions etc.
I work regularly in this room and like it a lot. The walls and ceiling are angled so the reflections go to the diffuser.

index.php/fa/9758/0/
Title: Re: D.I.Y. Diffusers
Post by: Vertigo on October 20, 2008, 03:42:56 pm
Quote:

Here is a pic of the diffuser I helped put up in a mates mix room.


Is it just me, or is that thing BREATHING???

-Lance

Title: Re: D.I.Y. Diffusers
Post by: KAyo on November 05, 2008, 06:09:56 am
Hi Chris,

So.. are the depth's off the slats different, or are they mushrooming out together from the base frame?

Often, thinking of back wall design myself.

Cheers,
Kayo
Title: Re: D.I.Y. Diffusers
Post by: Hallams on November 05, 2008, 12:31:37 pm
KAyo wrote on Wed, 05 November 2008 22:09

Hi Chris,

So.. are the depth's off the slats different, or are they mushrooming out together from the base frame?

Often, thinking of back wall design myself.

Cheers,
Kayo


Hi Kayo. The slats are at right angles to the rear wall and of differing lengths.
Title: Re: D.I.Y. Diffusers
Post by: silverback-recording on May 27, 2009, 09:51:02 pm
I emailed mio culture.  They had an acoustics sheet available in pdf form.  Here it is as two jpg files.  Sorry about the quality, it was sent in poor condition, and I didn't change that since it should still be legible.index.php/fa/12378/0/
Title: Re: D.I.Y. Diffusers
Post by: silverback-recording on May 27, 2009, 09:53:55 pm
sheet number 2index.php/fa/12379/0/
Title: Re: D.I.Y. Diffusers
Post by: silverback-recording on May 27, 2009, 09:56:04 pm
Just noticed that the pages I got said 3 of 4 and 4 of 4, not sure if there was anything else important on the first two pages or if it were more of a cover letter situation.