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types of wool

79.178.136.64

Hi,
my room is treated with FRK corner traps all around.

60 Hz is still should be tamed - it's 15-20 DB louder than 55 and 65.

all other frequencies are OK (incl 90 and 120).

i'm thinkin to implement Ethan's advise and covers also all ceiling/wall corners.

i found a source for acrylic wool which has NRC of 0.85 (0.45 at 125 hz and 0.49 at 250 hz) - which i guess is quite good, isn't it?
what puzzles me they say that according to their measurement it's equivalent to rockwool at dencity 4.5pcf and to fiberglass wool at dencity 1.5 pcf.
so are those 2 types of wool really behaves so much differently?

Thanks,
Gennady

Follow Ups:

RE: types of wool - Ethan Winer 12:14:42 02/03/09 (2)
I never tested this combination of materials, but I can tell you that covering more corners, and the front and rear walls too, is the best approach. Any of those materials should be fine, with FRK type facings being better than unfaced for the corners.

--Ethan
- RE: types of wool - Croc 13:34:38 02/03/09 (1)
  Hi Ethan,
  what they mean is not a combination - they say that it's equivalent to rockwool at dencity 4.5pcf or to fiberglass wool at dencity 1.5 pcf.
  
  this indicates that rockwool and fiberglass behaves very diffrently - which is strange to me.
  what is your expirience?
  - RE: types of wool - Ethan Winer 12:20:40 02/04/09 (0)
    Again, I have no experience with those materials. The only types I've ever tested are three densities of rigid fiberglass with and without the FRK facing:
    
    Density Report
    
    --Ethan

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