Help with 80Hz problem!

[pers1]

Hi
I've meassured my room i have nulling around 82 hz that has an -12dB loss from 70hz.
I what do DIY and floor to backwall bass "corner" trap.
And I need u guys expertice what meassurment the trap should have and design.
My backwall, floor and roof is solid concret.
The room is front wall widt 3.21meter (plasterwall), backwall /rearwall width 2.62m(concret) room length 3.21m and Hight 2.38 m. Both floor and celling is concret.

Thanks for all help

PerS

[Glenn Kuras]

4" or thicker broad band bass traps in as many corners as possible. Hit the back wall also with 6" traps. See the following for layout.
GIK Acoustics: Room Setup

[pers1]

I thought Of building a back floor to wall corner trap.
Eks:
Corners 60 cm front 81Face Width (at a 45 degree Angel) and width 190 cm.
10 cm airgap and then rockwool cut so it has a 45 degree Angel.
all closed air tight.

Pers

[Glenn Kuras]

Can you post a drawing? Sorry it is early here so my brain is not getting what you are doing.

[pers1]

Originally Posted by Glenn Kuras

Can you post a drawing? Sorry it is early here so my brain is not getting what you are doing.

I`m thinking of making a "corner trap" (backwall trap) that is going on the floor horizontally against my back wall on the floor.
And as I have a 70- 80Hz problem this is the size i`m thinking of
In Norway RockWool has special sound fiberglass that I will use cut in 45-degree angle to each side wall!

My design thought:
Corner Bass Traps (backwall trap) Assuming the panel is at a 45-degree angle to each side wall
Face Width 48"= 121.92 cm Thickness 1/8"= 4 mm =80Hz
Sides 23.62in
Air gap from the front panel 3.93in before the rockwool.
All air tight/Sealed!

Looking something like this:


Will this work or do I need other meassurments?

[Glenn Kuras]

I would just use fabric for the face. No need for it to be air tight.

[pers1]

Originally Posted by Glenn Kuras

I would just use fabric for the face. No need for it to be air tight.

Would u then recommend that the rockwool goes all the way to the front no gap as designed now?
Will it then absorbed a broader freq. spec or still be most effective at 70-80hz?

PerS

[Glenn Kuras]

Originally Posted by pers1

Would u then recommend that the rockwool goes all the way to the front no gap as designed now?
Will it then absorbed a broader freq. spec or still be most effective at 70-80hz?

PerS

Sure making them thicker is never a bad thing and YES it will be very effective at 70 to 80hz

[pers1]

Originally Posted by Glenn Kuras

Sure making them thicker is never a bad thing and YES it will be very effective at 70 to 80hz

Thanks I will start building ; )
I will poste picture when I´m done!