Acoustic Foam – Sound Absorption
Open cell acoustic foam is proven to show good sound absorption characteristics. Particularly with the medium to high end of the frequency spectrum. The profile cut structure of the pro acoustic foam tiles and optimally designed profile exhibits a dual action on any incident sound waves.
Firstly the sound waves upon hitting the peaks and valleys of the foam panels will get deflected in several directions. Which will weaken them. Secondly sound waves that penetrate the foam will get absorbed in the cell structure. This double action means that you almost totally eliminate echoes from the top end of the frequency spectrum.
Low frequency Sound Absorption
To absorb lower frequency of with foam there is only one answer “THICKER TILES”. The thicker tile the more the tile will deal with lower frequencies!
Very low frequencies are hard to eliminate. This would require gigantic blocks of foam in order to completely absorb the sound incident applied on them. However with the correct combination of positioning. foam pads and acoustic panels you can reduce lower frequency distortion.
The use of corner bass traps is essential in dealing with low frequency response problems. Although acoustic foam is primarily used for high to medium frequency sound absorption the placement of the foam can help also with low frequency issues.
The simple rule of thumb is the thicker the foam the better its sound absorption at lower frequencies. Don’t be fooled by sellers spin on density or foam grade most acoustic foams are similar and have an open cell structure. quite light at around 25 to 30 kilo in density and of a similar cell structure hardness and porosity.
There is only one wat to know if the foam is good for acoustic applications look for the NRC (noise reduction coefficients) and the relevant test data specific to that tile or bass trap.