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Old 27th December 2012
Gear Nut

Thread Starter

Hey folks,
tried searching, but without success.
I read in a book of acoustic, that painting the face of the glass wool with a roller(with ink), decrease in absorption mid/high and the bass slightly improve.
Someone already tried?
Old 27th December 2012
Gear Guru
Glenn Kuras's Avatar
It will decrease the absorption on the upper frequencies. Also it could start to act as a membrane but I would not think it would improve the lower frequency absorption by all that much. You would just have to try it and see.
Old 27th December 2012
Lives for gear
Rod Gervais's Avatar

I am interested which book you read this in.

I can see how it would affect high and perhaps high mids - but do not see in my mind's eye any increase in LF absorption - like Glenn said above - you would have to test it... and I don't know that a roller would be my method of application if I were interested in this.....

Old 28th December 2012
Gear Nut

Thread Starter
hey Glenn and Rod, thanks for the reply.
It is allowed to draw a similar graph to the book and post here?
Old 28th December 2012
Lives for gear
Rod Gervais's Avatar

there can be issues with posting copyrighted materials - however - as long as you propery identify the source, the detail you post is in it's entirety - and is done strictly for the purpose of gaining additional info - it is not really a copyright issue....

Old 28th December 2012
Gear Nut

Thread Starter
Hey Rod,
You saw the picture that I sent? The name of book in english is
" acoustic applied to noise control, Bistafa,S.R. (The real name is in my native language)
In this book, he does not enter into detail. Just shows a graph and a brief description.
The graph (absorption coefficient x Freq) is cited as the source "Gonzalez, M.F.
Old 28th December 2012
Lives for gear
Rod Gervais's Avatar

S.R. Bistafa is a widely recognized expert in the field of acoustics.......

Understand though that everything has to be taken in context - thus seeing a simple chart - with no understanding of everything that accompanied that chart - is not in and of itself an answer to a question.

Old 28th December 2012
Lives for gear
gullfo's Avatar

Old 28th December 2012
Gear Nut

Thread Starter
pretty hot .pdf. thanks gullfo.
Rod, He explains sound absorption, after a long text, he puts a frame with 4 images.
"Image10.4 -> Factors influencing the sound absorption of porous / fibrous."
There are 4 images. Thickness Variation, Variation of Density, Effect of Air Layer and Effect of application of paint.

The image of paint application is something like that :
View image: Ink

Just wanted to know if someone already made this experience with measuring, although each room can have a different result.
I think I'll test.
Thanks Rod
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