building diffusion on my back wall
Old 15th March 2013
  #1
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building diffusion on my back wall

So my room is 20.5 ft long, 14ft wide, and 7.9 ft tall. I am building adequate bass traps for my room but I'm wanting to put diffusers in. I have seen many people have them on the back wall where the couch is. I'm considering the BBC diffuser for the back wall. Is it bad to make 4 2x2 panels and put them together to make one large panel? Any suggestions?
Old 15th March 2013
  #2
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Glenn Kuras's Avatar
 

Sure you can make them small but why? I would think if you are going through all the hassle to build one it would be easier building it as one vs 4.
Old 15th March 2013
  #3
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I can't find plans online for size only freq which is 2x2 online
Old 15th March 2013
  #4
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Rod Gervais's Avatar
 

Quote:
Originally Posted by Glenn Kuras View Post
Sure you can make them small but why? I would think if you are going through all the hassle to build one it would be easier building it as one vs 4.
Agreed it would probably be easier to build - but would be a PITA to build in place - and probably quite heavy/cumbersome to install once built....... (I am assuming he is referring to the BBC skyline diffusor)

Rod
Old 15th March 2013
  #5
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Yes I am
Old 15th March 2013
  #6
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Anyone know of any plans that would help me build it in one piece rather than 4?
Old 15th March 2013
  #7
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adrumdrum's Avatar
 

A wood prd diffusor("skyline") around 600X600mm weighs around 20 kg.
the most common lengths for D.I.Y is 0 (0 no piece of wood), 50mm(1), 100mm(2), 150mm(3), 200mm(4).
and 45X45mm wood(or 2"x2") and plywood grund plate.
I think diffusion range is 800-4 kHz (correct me if I'm wrong)

A Windows program to calculate PRD(or only use the drawing with the lengths I wrote):
http://www.mh-audio.nl/user/acoustic%20calculator.asp

or:
mh-audio.nl - Skyline
but I found an error, Frequency high is not Hz it should be kHz(for example 35 hz is 35 khz)
Old 15th March 2013
  #8
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Gotta get my calculator out, I'm merican. Lol thanks
Old 16th March 2013
  #9
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Old 16th March 2013
  #10
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Quote:
Originally Posted by tumdrum View Post
So my room is 20.5 ft long, 14ft wide, and 7.9 ft tall. I am building adequate bass traps for my room but I'm wanting to put diffusers in. I have seen many people have them on the back wall where the couch is. I'm considering the BBC diffuser for the back wall. Is it bad to make 4 2x2 panels and put them together to make one large panel? Any suggestions?
what is the purpose of the room?

do you explicitly need to disperse energy in vertical and horizontal planes?
Old 16th March 2013
  #11
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It's a control room for mixing. This sounds like a stupid reason but, I figured dispersion on both planes would give me a better result than on 1 plane. No reason really, I just figured it would be more beneficial.
Old 16th March 2013
  #12
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Quote:
Originally Posted by tumdrum View Post
It's a control room for mixing. This sounds like a stupid reason but, I figured dispersion on both planes would give me a better result than on 1 plane. No reason really, I just figured it would be more beneficial.
are you emulating any particular response?
are you planning to attenuate high-gain early arriving indirect signals (reflections) and then presenting a later-arriving semi-diffused sound-field via the rear wall diffusers? if so, it is more appropriate to use 1dimenional diffusers with the wells oriented vertically such that the spatial dispersions take place in the horizontal plane (to induce lateral arriving returns). 2D diffusers are inherently more lossy and will disperse energy to the floor/ceiling of which is not entirely useful in such an application.

what is the distance from listening position to rear wall? it is best advised to allow 3x wavelength of the design frequency as minimum seating distance to the diffuser. eg, a QRD/PRD with a design frequency of 400hz (2.825ft) would require minimum seating distance of (3 * 2.825ft) = ~8.5ft ... which puts you in the "far-field" of the returns.
Old 16th March 2013
  #13
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Approximately 12 ft in front of the diffuser.
Old 16th March 2013
  #14
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But I will also have a couch about 6 in in front for clients to sit.
Old 17th March 2013
  #15
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Is there a program you can enter frequency AND dimensions you want and it gives you plans on how to make it?
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