Low ceiling (8') treatment

rich121

Well-Known Member
Dec 11, 2017
60
18
73
Yakima, Washington
My room is 17.5"W x 22.5"L x 7.8'H
I have expanded from 2 separate rooms to one large room.
The walls/ceiling are still open.
From what I understand, my low 8' ceiling is the biggest problem.
From what I understand, the frequency issues I will have are from 160Hz and below.

I was hoping to fill the ceiling with acoustic rock wool (I have 2"x6" ceiling joists, so a 5.5" ceiling cavity, but could add whatever needed depth) and then use acoustic ceiling tile with at least a .65/.70 absorption rating.

How would I calculate the thickness of rock wool used with the acoustic ceiling tile?

Could someone give me some references, books or links for more information?

Thanks,

Rick
 
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Cellcbern

VIP/Donor
Jul 31, 2015
407
180
405
68
Washington, DC
My room is 17.5"W x 24"L x 8'H
I have expanded from 2 separate rooms to one large room.
The walls/ceiling are still open.
From what I understand, my low 8' ceiling is the biggest problem.
From what I understand, the frequency issues I will have are from 160Hz and below.

I was hoping to fill the ceiling with acoustic rock wool (I have 2"x6" ceiling joists, so a 5.5" ceiling cavity, but could add whatever needed depth) and then use acoustic ceiling tile with at least a .65/.70 absorption rating.

How would I calculate the thickness of rock wool used with the acoustic ceiling tile?

Could someone give me some references, books or links for more information?

Thanks,

Rick
FYI:

 

rich121

Well-Known Member
Dec 11, 2017
60
18
73
Yakima, Washington

DonH50

Member Sponsor & WBF Technical Expert
Jun 23, 2010
3,826
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Monument, CO
There will be a null at 1/2 the distance between floor and ceiling. See if your ears are at 48" (or whatever that ends up being) and if not then that is not a big deal. Hopefully true as there's not a lot you can do about nulls -- treatment would have to be so thick as to be impractical. For reflections at higher frequencies, Rockwool and acoustic tiles will work, and I would fill the space above the tiles with Rockwool and that should be enough. Acoustic panels are generally 4" thick so 5"~6" is fine. I would keep the ceiling as high as possible (not drop it further) for acoustic and aesthetic reasons.

Ethan's site has a lot of useful material: www.realtraps.com

HTH - Don
 
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adyc

VIP/Donor
Jan 6, 2013
629
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388
Not really room treatment advice. But a tall line source speaker will mostly reduce low ceiling acoustic problems.
 

rich121

Well-Known Member
Dec 11, 2017
60
18
73
Yakima, Washington
Not really room treatment advice. But a tall line source speaker will mostly reduce low ceiling acoustic problems.
Yes, I waited all last year for the release of Danny of GR-Research, 'Line Force' as I was very interested... but hopefully by next year.
 
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rich121

Well-Known Member
Dec 11, 2017
60
18
73
Yakima, Washington
There will be a null at 1/2 the distance between floor and ceiling. See if your ears are at 48" (or whatever that ends up being) and if not then that is not a big deal. Hopefully true as there's not a lot you can do about nulls -- treatment would have to be so thick as to be impractical. For reflections at higher frequencies, Rockwool and acoustic tiles will work, and I would fill the space above the tiles with Rockwool and that should be enough. Acoustic panels are generally 4" thick so 5"~6" is fine. I would keep the ceiling as high as possible (not drop it further) for acoustic and aesthetic reasons.

Ethan's site has a lot of useful material: www.realtraps.com

HTH - Don
Thank you... I have watched his youtube videos.
With different seating and a little slouching, ear height should be between 35" to 38".
 
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