Quote:
Originally Posted by Jason Jones  OK. Here is your trade-off:
An omni style diffusor will have better low frequency performance than an equivalent skyline style diffusor when one panel is placed as you describe. But, they have LOTS more absorption. An 8" deep omni type may have an absorption coefficient of .8 or .9 at 250 hz and around .5-.6 across the upper band. For a skyline, you can cut those numbers in half.
Below 500 hz or so, all of the scattering is coming from the exposed edges. The omni has better edges for that. This is also the answer to your 4" diffuser with specs claiming effectiveness down to 125 or so. With the edges exposed a flat 60 cm x 60 cm board 10 - 15 cm deep will scatter the low end reasonably well. That is why we recommend spacing between our D1 diffusers: it takes full advantage of this.
The other thing to keep in mind is construction. If the wells are not airtight, you will get lots more peaky absorption. So, which design you feel more comfortable with the construction should also factor in.
Assuming you definitely want a 2-D diffuser, I would recommend the skyline type. But, think it over. Also, I don't know how much distance you have behind you, but a 2-D array of 1-D diffusers works very well if you have some distance to let them work.
Jason |
Well at the moment I only have about 1.2m behind me, which isn't a lot at all. I have read that Skyline type diffusors are the best type for small rooms. can you confirm this?
I currently have 4 Wave Panels corner traps installed and I plan on building 2 polycylindrical diffusors filled with rockwool for low frequency absorption. so i guess additional absorption ontop of this is not something i really need or want.
If I make the well depth of the omni 10-15cm like you suggested, would this lower the amount of absorption?
The construction of an omni Vs. a skyline would be a little bit harder IMO as i would have to be far more accurate in making sure everything is airtight. But generally the amount of effort required to construct the diffusor doesn't bother me. I just want to get it right
So I guess like you said, the Skyline probably would be a good idea. But then again, one of my main aims is to create the best low freq. diffusion I can in order to reduce the problem frequencies in my room
hmm.. I have a lot to think about!
thanks everyone