Home made Skyline Diffusors

Please send information re: where you purchased the @" X 2" X 12" balsa wood blocks for $1.02 each. The best price I could find was in excess of $3.00 each. Also, have you made a "skyline" with the balsa wood yet? How did it turn out? I would like to do this for first reflections from the ceiling in an audio listening room. Thank you for you time to reply. Dudley Miller, Indianapolis

Hello everyone, glad to join in on an old discussion. Hopefully I will not be kicking a dying horse (or whatever that expression is... :D ) Regarding the BBC papers about building one of those diffusers, I had been thinking about a light and somewhat cheap material to build them...and the only thing that came to mind was EPS (extended polystyrene foam?) in large sheets from the local hardware store... but how to cut that stuff? I found some hobbyists on the web using hot wire cutting techniques to make semi-clean cuts by melting through the foam. I tried this, poured some glue on the pieces and came up with this: I've only made one so far, as it's not so much fun building, but it may spark some ideas. I don't know if this stuff is a viable material for practical use (fireproof, density, etc...) but it was interesting putting it together. If this helps at all, cool - if I wasted my time (as in, the foam ain't good for diffusion), please let me know, so I don't go mad cutting foam in my garage. :wink: Thanks to all here for all their knowledge. I'm just getting started with this acoustics thing. Best Regards, Jesus

I read the BBC paper, and I have to admit, my English is not good enough to understand everything. The plan shows that there are 4 or 5 different lenghts of wood or pvc pipe. Now, how do I know what length is (on the plan) the # 0 , the #1, the #2... I mean, how do I know that all #2 are 28mm (hypotheticaly) thx

Henrik wrote:

OK, cool. I'll try it myself some day. It DOES seem a bit tedious to make them out of 1156 17 mm wide pieces of wood...

That's why you see more of the 2D diffusors built for wider-band absorption- you know, the ones with vertical wells of different depths instead of the 3D ones with squares. If you've got a fairly absorptive ceiling, it doesn't probably matter if what hits it is diffused or not. One thing that's interesting to me is the idea that when you make a *2D* diffusor without walls between the wells, it drastically reduces it's effectiveness: I wonder if it's true with the 3D versions?

:oops: I just found this site, regarding the diffusers... http://www.bobgolds.com/DifuserKgveteran/home.htm I guess I didn't spend enough time searching the net before I sat down and though about this. I'm sure I'm not the 1st to do that... it's just proof that I'm new here... tenkas: I just assumed from the BBC article about the lengths. I think they give a particular length as the deepest, and looking at the drawings, it looked to me like #2 would be half of that, and #1 half of #2, and #3...etc... (I think this is what you're asking, no?) Hope it helps. -- Jesus