m00n Posted September 19, 2003 Share Posted September 19, 2003 Hey all... Anyone know where I can find the absorbtion coefficient of soundboard? Quote Link to comment Share on other sites More sharing options...
artto Posted September 19, 2003 Share Posted September 19, 2003 What kind of sound board? & How thick? How is it going to be used? And in conjuction with what other materials? Quote Link to comment Share on other sites More sharing options...
m00n Posted September 19, 2003 Author Share Posted September 19, 2003 It's either 1/2 or 5/8. I don't know the official name, but here is a pic of it. It's going to be used for low frequency sound absorbtion. I plan on making panels using this and rigid fiberglass as talked about here in this article www.ethanwiner.com/acoustics.html So basically what I am trying to do is get information on various fiberglass, soundboard so I can see what frequencies I can absorb. Quote Link to comment Share on other sites More sharing options...
picky Posted September 24, 2003 Share Posted September 24, 2003 m00n: I don't know if this will help you, but I found this thread today on the STC-rating of soundboard (Sound-Transmission Class). It also has a link at the bottom of it's page to more information. I hope this helps! http://alsnetbiz.com/homeimprovement/soundbd1.html Additional info: http://alsnetbiz.com/homeimprovement/faq10.html -Picky Quote Link to comment Share on other sites More sharing options...
m00n Posted September 24, 2003 Author Share Posted September 24, 2003 Hey thanks picky!!! Quote Link to comment Share on other sites More sharing options...
Rudy81 Posted September 28, 2003 Share Posted September 28, 2003 M00n: If you really want to take the time and treat your room properly, I suggest you the F. Alton Everest's book "Acoustic Techniques for Home and Studio". This is a must have for any serious audio enthusiast. I used many of the suggestions for getting the right materials to treat my room. The problem comes in getting the materials, many manufacturers will not sell to the public or unless you buy the stuff by the truckload. I do know that getting a bass absorber thick enough to be useful can be cost prohibitive. You might consider bass traps of one design or another. In my case, I made some bass tube traps, and they worked extrememly well. Quote Link to comment Share on other sites More sharing options...
artto Posted September 28, 2003 Share Posted September 28, 2003 The sound coefficient of 1/2" fiberboard (often used as 'soundboard') such as Celetex or Homosote is 0.30 to 0.40. Using 0.35 should be adequate & put you in the ballpark for calcuation purposes Quote Link to comment Share on other sites More sharing options...
m00n Posted September 28, 2003 Author Share Posted September 28, 2003 ---------------- On 9/28/2003 12:04:11 PM Rudy81 wrote: M00n: If you really want to take the time and treat your room properly, I suggest you the F. Alton Everest's book "Acoustic Techniques for Home and Studio". ---------------- I have it and I am trying it's just a bit over my head is all. Quote Link to comment Share on other sites More sharing options...
m00n Posted September 28, 2003 Author Share Posted September 28, 2003 artto, from what I undertand about coffiecents, it's something that is different for every frequency... So, what that do you know what frequency range they were talking about? Quote Link to comment Share on other sites More sharing options...
artto Posted September 29, 2003 Share Posted September 29, 2003 The NRC, or Noise Reduction Coefficient is defined as the arithmetic mean (average) of sound absorption coefficients at 250, 500, 1000, and 2000 Hz, rounded to the nearest 0.05 metric sabin per square meter. A NRC rating of 0.25 for instance means that there is an AVERAGE of 25% reduction in reflected sound from that material at those frequencies. In some measurement testing, 125Hz might also be added. Sometimes not. Depends on the testing laboratory & what the manufacturer wants. Some labs just measure the absorption of the main front surface, others include the edges, or depth of the material. Unfortunately, theres a lot of gray area here & its not all black & white. Quote Link to comment Share on other sites More sharing options...
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