this type of rock wool could work?

[PRODIJ]

hello trying to build my own bass traps since here they only sell auralex like 3 times the price they sell for in the states..

so I found 144kg/m3 rock wool, 0.61m * 1.22m
deph 2" or 4"

could it work?

any help is greatly apreciated

[Jens Eklund]

Originally Posted by PRODIJ

hello trying to build my own bass traps since here they only sell auralex like 3 times the price they sell for in the states..

so I found 144kg/m3 rock wool, 0.61m * 1.22m
deph 2" or 4"

could it work?

any help is greatly apreciated

If you intend to absorb low frequencies with porous material, it needs to be very deep. At least 6" with at least 6" air gap. 144kg/m³ is excessively dense to be effective at low frequencies (unless used as some sort of membrane resonator):




Unless you want to have a dead room, I also recommend covering the panels with a thin board to avoid excessive loss in the highs.


Sincerely Jens Eklund



EDIT:

Oh, and if you need to absorb very low frequencies (sub 60-80 Hz) you should search for pressure based absorbers (membrane/panel or Helmholtz resonators).

/Jens

[PRODIJ]

Originally Posted by Jens Eklund

If you intend to absorb low frequencies with porous material, it needs to be very deep. At least 6" with at least 6" air gap. 144kg/m³ is excessively dense to be affective at low frequencies (unless used as some sort of membrane resonator):

Attachment 199130
Attachment 199131

Unless you want to have a dead room, I also recommend covering the panels with a thin board to avoid excessive loss in the highs.


Sincerely Jens Eklund



EDIT:

Oh, and if you need to absorb very low frequencies (sub 60-80 Hz) you should search for pressure based absorbers (membrane/panel or Helmholtz resonators).

/Jens

thank you for your help jens.

ohh shame.. they were so cheap but ohh well
For now I will start searching for 100kg/m3 stonewool...

when I find them I will post pics of my build

[Jens Eklund]

Originally Posted by PRODIJ

thank you for your help jens.

ohh shame.. they were so cheap but ohh well
For now I will start searching for 100kg/m3 stonewool...

Why 100kg/m3?



/Jens

[sorin]

what about 70kg/m3 ?
would 2 layers of 2 different density help?
(ex: 70kg/m3 and 40kg/m3 , 5 and 10cm)

Thanks

[lectric]

Originally Posted by

[COLOR=black

Unless you want to have a dead room, I also recommend covering the panels with a thin board to avoid excessive loss in the highs.[/COLOR]


Sincerely Jens Eklund

/Jens

Thanks for your info. Do you can explain this??? How I can cover the bass traps...with a thin board of wood, plastic???

[Jens Eklund]

Originally Posted by lectric

Thanks for your info. Do you can explain this??? How I can cover the bass traps...with a thin board of wood, plastic???

Reducing high freq absorbtion on DIY bass traps?

/Jens