A question about building a sealed box (acoustic suspension).

piro · 8th March 2005, 04:03 PM

I have the math I need in order find the box volume, but I'm not sure whether the actual dimensions are of importance (the hXwXd).
I have gathered that they shouldn't be equal to or whole multiples of one another, but I don't know anything else besides it.
ideas anyone?

TIA,

Jonathan

Ron E · 8th March 2005, 05:00 PM

It really doesn't matter much - contrary to what the beginner books say - especially once you place damping material inside. It is much more important where you place the drivers on the baffle.

piro · 8th March 2005, 05:27 PM

could you be a bit more specific?

Ron E · 8th March 2005, 08:51 PM

Baffle dimensions and driver placement on the baffle affect the diffraction of sound as it reaches the edges of the baffle. When the sound wave reaches a change in the space it radiates to, it reradiates. It is best if these reradiations do not occur all at the same time - worst case a circular baffle with the driver at the center of the circle.

Search for baffle diffraction with Google - you will find a few articles and a few simulators - one a full-featured excel spreadsheet I had a small hand in and one a simpler standalone program by a person (Svante) who frequents this board.

these baffle diffraction effects are much more prominent than box shape related effects inside the box.

8th March 2005, 04:03 PM	#1
piro diyAudio Member Join Date: May 2004 Location: Tel aviv	A question about building a sealed box (acoustic suspension). I have the math I need in order find the box volume, but I'm not sure whether the actual dimensions are of importance (the hXwXd). I have gathered that they shouldn't be equal to or whole multiples of one another, but I don't know anything else besides it. ideas anyone? TIA, Jonathan

8th March 2005, 05:00 PM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	It really doesn't matter much - contrary to what the beginner books say - especially once you place damping material inside. It is much more important where you place the drivers on the baffle. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

8th March 2005, 08:51 PM	#4
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	Baffle dimensions and driver placement on the baffle affect the diffraction of sound as it reaches the edges of the baffle. When the sound wave reaches a change in the space it radiates to, it reradiates. It is best if these reradiations do not occur all at the same time - worst case a circular baffle with the driver at the center of the circle. Search for baffle diffraction with Google - you will find a few articles and a few simulators - one a full-featured excel spreadsheet I had a small hand in and one a simpler standalone program by a person (Svante) who frequents this board. these baffle diffraction effects are much more prominent than box shape related effects inside the box. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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8th March 2005, 05:27 PM	#3
piro diyAudio Member Join Date: May 2004 Location: Tel aviv	could you be a bit more specific?

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