Kit

Perforated plywood?
« on: April 20, 2008, 10:22:31 AM »
Anyone of you got any experience with using perforated plywood as acoustic treatment of a room?

Thanks.
"Relaxing on the axis of the wheel of life."


Svart

Perforated plywood?
« Reply #1 on: April 20, 2008, 11:46:28 AM »
If the holes are the same size then you will only get absorption in a very narrow region of frequencies, the Helmholtz Resonator effect.   You would need a lot of different, specific size holes to tune the panel.

http://www.audioholics.com/education/acoustics-principles/helmholtz-resonant-absorber
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beatpoet

Perforated plywood?
« Reply #2 on: April 20, 2008, 02:25:59 PM »
I wonder if using a variable distance between the backing surface would broaden the bandwidth? Some damping would certainly widen the Q.

Svart

Perforated plywood?
« Reply #3 on: April 20, 2008, 07:20:25 PM »
It does.  There is a lot of math involved in determining the "right" depth and width of the holes for tuning though.
Welcome to the GroupDIY leper colony! when something falls off, we just replace it with a tube!
occupation: General Electron Mayhem

Alesis X2 information repository:
http://www.theopiumdenproductions.

Perforated plywood?
« Reply #4 on: April 20, 2008, 09:20:33 PM »
I think slats are the way to go.  There's loads of info on john sayers forums and users there are pretty keen in helping

http://www.johnlsayers.com/phpBB2/index.php

ubxf

Perforated plywood?
« Reply #5 on: April 21, 2008, 02:55:56 AM »


 

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