Commercial perforated ceiling tiles.

Post and discuss acoustic topics, Studio design, construction, and soundproofing here

Commercial perforated ceiling tiles.

Postby Zaphod » Fri Oct 19, 2007 12:19 pm

These days in the Italian home theatre forum i read, a guy posted
the specs of some perforated panels, that seem quite good...

(here is the post he made: http://www.avmagazine.it/forum/showpost.php?p=1046004&postcount=20)

and there is the website for the stuff...

http://www.acustica-edilizia.it/gyptone_plank.htm

I played with Chris' porous absorber calculator getting graph much
more bell shaped, but it does not work perfectly on openoffice, so
i'm not really sure of the result.

The guy asked if he should go with the stuff and i advised him
against, being a tuned device, what do you think?

The graph on the site are so flat for the medieval band limited
graph or for some other reason?
I try never to get involved in my own life. Too much trouble. :mrgreen:
Zaphod
 
Posts: 1931
Joined: Wed Jul 28, 2004 9:51 pm
Location: Rome, Italy

Re: Commercial perforated ceiling tiles.

Postby Eric.Desart » Fri Oct 19, 2007 12:26 pm

Zaphod wrote:The guy asked if he should go with the stuff and i advised him
against, being a tuned device, what do you think?


:twisted: That you're wrong,
.....and that you should base yourself and your decisions on these absorption curves in that doc, which are typically for such stuff.
But take into account that also cavity and absorption material plays a roll.

.
Eric.Desart
Moderator
 
Posts: 2461
Joined: Tue Feb 10, 2004 4:29 am
Location: Antwerp, Belgium

Postby bert stoltenborg » Fri Oct 19, 2007 1:11 pm

Hey wrong Zaph,

there is some paper about perforated panels on the net. Maybe SuperBob knows where....

:mrgreen:

I found it on my HD, I could send it if you PM your mail adress. It's 5.5 MB, if you're interested.
You're not totally wrong, behaviour depends on how the perfs are done.
But  this ceilings are broadband.
bert stoltenborg
 
Posts: 4575
Joined: Sun Apr 18, 2004 11:03 am
Location: Achterhood, Netherlands

Postby Terry Montlick » Fri Oct 19, 2007 1:39 pm

A ceiling cavity vs. none makes a huge difference. ASTM A mounting is flush against the surface, while ASTM E-400 mounting has a 400 mm (16") air space to the hard surface, a typical ceiling cavity depth. The latter sort of mounting can turn the most mediocre acoustical tiles into stellar wideband absorbers!  :mrgreen:

Regards,
Terry
Terry Montlick
 
Posts: 1143
Joined: Mon Apr 12, 2004 9:31 pm
Location: Rhode Island, USA

Postby bert stoltenborg » Fri Oct 19, 2007 2:29 pm

Terry Montlick wrote:A ceiling cavity vs. none makes a huge difference. ASTM A mounting is flush against the surface, while ASTM E-400 mounting has a 400 mm (16") air space to the hard surface, a typical ceiling cavity depth. The latter sort of mounting can turn the most mediocre acoustical tiles into stellar wideband absorbers!  :mrgreen:

Regards,
Terry


Almost as stellar as a Super Chum!
:mrgreen:
If you view life with the knowledge that there are no problems, only opportunities, you are a marketing manager.......this is my personal philosophy
bert stoltenborg
 
Posts: 4575
Joined: Sun Apr 18, 2004 11:03 am
Location: Achterhood, Netherlands

Postby Zaphod » Fri Oct 19, 2007 3:57 pm

Ooops  :oops:
:mrgreen:

The graphs are with 200 mm airgap.

Not having such space, he plans (i think an installer pointed him
that way), to wall mount them with a 45mm cavity all filled with rockwool
or the equivalent.
That's because he wants to absorb bass and has no space for big
chunks or deep absorbers.

Ok, now i have to run and take back what i wrote  :mrgreen:   :mrgreen:   :mrgreen:
I try never to get involved in my own life. Too much trouble. :mrgreen:
Zaphod
 
Posts: 1931
Joined: Wed Jul 28, 2004 9:51 pm
Location: Rome, Italy

Postby Zaphod » Fri Oct 19, 2007 4:02 pm

bert stoltenborg wrote:Hey wrong Zaph,
I found it on my HD, I could send it if you PM your mail adress. It's 5.5 MB, if you're interested.
You're not totally wrong, behaviour depends on how the perfs are done.


If it's easy and filled with picture, feel free to mail them  :mrgreen:

Does not one have to compensate for >4khz frequencies? (not a
difficult problem, i'd say)
I try never to get involved in my own life. Too much trouble. :mrgreen:
Zaphod
 
Posts: 1931
Joined: Wed Jul 28, 2004 9:51 pm
Location: Rome, Italy

Postby Bob » Fri Oct 19, 2007 7:21 pm

Regards
Bob Golds
"The only thing we regret in life is the love we failed to give."
"Be a rapturist -- the backward of a terrorist. Commit random acts of senseless kindness, whenever possible" - Jake Stonebender
Bob
 
Posts: 4360
Joined: Sun Feb 08, 2004 4:37 am
Location: Oakville, Ontario, Canada

Postby bert stoltenborg » Sat Oct 20, 2007 11:51 am

Cool, Bob!
If you view life with the knowledge that there are no problems, only opportunities, you are a marketing manager.......this is my personal philosophy
bert stoltenborg
 
Posts: 4575
Joined: Sun Apr 18, 2004 11:03 am
Location: Achterhood, Netherlands

Postby Eric.Desart » Sat Oct 20, 2007 1:29 pm

Bert,

You refer to an arbitrary doc, without naming it. Just referring to Bob who must have a Crystal ball
I get curious.

Bob as mostly does some work, entering links to documents, hoping somewhere in-between is the doc you have in your mind.
You just reply with "Cool".

I still can not analyze what you were talking about.

Is it possible for you to refer to a doc, just giving it a standard reference as a name and an author?
:twisted: That way people with standard working mental processes can follow as well.
Image
divinely-inspired
Eric.Desart
Moderator
 
Posts: 2461
Joined: Tue Feb 10, 2004 4:29 am
Location: Antwerp, Belgium

Postby gullfo » Sat Oct 20, 2007 5:15 pm

hee hee he said "mental"  8O
Glenn
gullfo
 
Posts: 90
Joined: Fri Dec 16, 2005 8:46 pm
Location: Old Tappan, NJ USA

Postby bert stoltenborg » Sat Oct 20, 2007 6:23 pm

It was something with that iperf, Eric.
I found it on my HD, but alreasy lost it again.
If you view life with the knowledge that there are no problems, only opportunities, you are a marketing manager.......this is my personal philosophy
bert stoltenborg
 
Posts: 4575
Joined: Sun Apr 18, 2004 11:03 am
Location: Achterhood, Netherlands

Postby Eric.Desart » Sat Oct 20, 2007 6:30 pm

:) Thanks Bert,

If you compare this stuff, it's still important to take into account that the perfo sheet in these docs from iperf have large holes compared to thickness, while this slotted or drilled gypsum board stuff are small holes versus thickness, hence more subject to the Helmholtz stuff.

:mrgreen:  And thanks to Bob once more, for his assistance in finding the answer on a non-defined question.
Image
divinely-inspired
Eric.Desart
Moderator
 
Posts: 2461
Joined: Tue Feb 10, 2004 4:29 am
Location: Antwerp, Belgium

Postby Ido » Sun Oct 21, 2007 9:23 am

bert stoltenborg wrote:I found it on my HD, but alreasy lost it again.


:D  :D  :D


Zaph, a major thing with perforated gypsum board is that it has a an absorptive cloth lining in the back, which helps it work "better", whatever that means.
if used smart, these "simple" things can be good, cause they don't overabsorb HF.
Ido
 
Posts: 2201
Joined: Mon Feb 09, 2004 7:47 pm
Location: Israel

Re: Commercial perforated ceiling tiles.

Postby Pop Alexandra » Fri Feb 05, 2021 9:16 am

If find it a bit easier to perforate the ceiling panels myself, as sometimes the stock perforations don't fit the project, but I've heard a lot of people being happy with the perforated ones, too.
Pop Alexandra
 
Posts: 2
Joined: Sat Nov 17, 2018 8:43 am


Return to Discussion

Who is online

Users browsing this forum: No registered users and 11 guests

cron