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.