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DIY Diffusors

TKoP

Well-Known Member
[youtube]http://www.youtube.com/watch?v=qFeM2uWuMZI[/youtube]


So, for the experts out there, for a room that was presumably 8x12, how many of those would one want? and would you want them any place other than the back wall? Assume were going with a live end/dead end listening room.
 
One to four placed on the rear wall directly opposite of the speakers midrange and tweeters. If you use a laser pointer you can spot the area on the wall directly. That is where I would start.
 
I copied these notes from another site/person for the block type diffusers.

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!
The cheapest commercial diffusor you can get in the market is the Skyline type diffusors sold by Hiway Laser. If you went to the KLIAV show in July you would notice how these diffusors look like and how they place them in one of their demo room. You need to get minimum 8 pieces of 2'x2' in order to perceive an appreciable sonic difference.



http://www.bbc.co.uk/rd/pubs/reports/index.shtml
http://www.acousticsfirst.com/artdif.htm
 
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