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#1939132 - 05/08/08 07:54 AM

ceiling isolation question

Frankyboy
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Registered: 04/10/08
Posts: 10

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hi all
For a studio like mine(22X18X8ft( minus the angled wall)), i have above 2880 cu feet but only 8 foot for the ceiling(including support beam space), if i do all the ceiling with 1 inch 703, i will approched 270 sabins of absoptions at 500hz, witch get me close by 12 sabins of a RT60 of .5 second that seem to be a reasonable target in the master handbook of acoustic p.256... If i want to keep that reverberation time, i won't be able to put much mid absorber on the wall and absolutely no high absorber since at that distance from the beggining of the beam and the next level floor, the absoption coefficient is even better. Of course i will be able to put a lot of low and high plywood absorber. This is clear to me that it won't sound right because there is too much reflective surface on perpendicular wall, the dispaching of the absorption is real bad. Now in Ethan's FAQ, he say it is better for low ceiling studio to put as much absorber possible to give a high ceiling impression. Is it still true with a studio with those dimension? Should i not count the ceiling isolation and only calculate the reverberation time for the wall surface only via total volume like there is no ceiling?
my idea is to go that way(reverberation time calculated for the wall, dead ceiling), but i would like to know what you think and if ive understand correctly?

thx you very much for your help
Frank Thompson

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#1939705 - 05/09/08 08:11 AM

Re: ceiling isolation question [Re: Frankyboy]

Ethan Winer
MP Hall of Fame Member

Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA

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Frank,

Originally Posted By: Frankyboy

if i do all the ceiling with 1 inch 703

One inch is not thick enough for a ceiling absorber (or any absorber) because it absorbs highs more than lows. The goal in all music applications is to have uniform absorption over a wide range of frequencies. For a ceiling I'd use 2 inches thick minimum, and four inches is even better.

Quote:

Now in Ethan's FAQ, he say it is better for low ceiling studio to put as much absorber possible to give a high ceiling impression. Is it still true with a studio with those dimension?

Yes.

Quote:

Should i not count the ceiling isolation and only calculate the reverberation time for the wall surface only

No, the absorption on the ceiling is part of the total and must be included.

--Ethan

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