Acoustical Treatments Master Thread - Page 347 - AVS Forum
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post #10381 of 10382 Old Yesterday, 09:22 PM
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Originally Posted by badger985 View Post
I was looking to make corner bass traps, and was going to buy Owens Corning 703 and cut them into the correct dimensions, however when doing research I found the following

Owens Corning "Select Sound" Black Acoustical Board 2" inch thick has an NRC of 1.00 the same as 703, but it also states that this reduces sound reverb, which 703 does not. Would this be a better product to create Bass Traps out of?

To answer your last question first "Would this be a better product to create Bass Traps out of?"
No.
Please see: http://www.bobgolds.com/AbsorptionCoefficients.htm
look for 703, and compare it against Black Acoustic Board at {125hz, 250hz, 500hz, 1000hz, 2000hz, 4000hz}
There are lots of things very similar to 703, and anything that's similar is just fine.


The 'reverb' comment just seems odd to me. Either used correctly should take care of reverb. Either used insufficiently will not take care of reverb. A myriad of other things can be used to take care of reverb.

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post #10382 of 10382 Old Yesterday, 09:32 PM
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Originally Posted by coolgeek View Post
I am looking to build a gentle diffusion.. and was thinking of using those 'vinyl tiles' that people use for flooring would work?

Do the vinyl absorb the sound or reflects them? If they absorb, then it won't work.

I was thinking of getting those and then bend them to semi-round... it's easy to build.. just put a bunch of them in right angles, bent into half round shapes...

Basically something like below (contour type diffusers) but built out of vinyl floor tiles rather than wood:



Vinyl will reflect some frequencies (higher f), and transmit (through it) other frequencies (lower f).
Generally speaking, anything more solid than 1/8" Masonite is ok as a diffuser.


The frequencies it has a hope of diffusing are proportional to the size of each.
The rule of thumb is:
- at wavelengths significantly smaller than the object, get defused as light bouncing off a curved mirror.
- wavelengths significantly larger than the object, ignore the object
- wavelengths the same size as the object, reflect randomly.


With all of these being identical, spaced identically, you might get lobbing effects. Random sizes with random placement, give better diffusion.

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