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volume of odd shaped box?


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bigjohnny 
Copper - Posts: 293
Copper spacespace
Joined: September 23, 2008
Location: Ontario, Canada
Posted: June 27, 2012 at 11:42 AM / IP Logged  
Long time no see... I believe it's been maybe 5 years since I was here last.
I finally got a basic system in my car so many years later.
Long story short, the box I have is shaped funny and I need to know the volume because I think the port size is wrong as it makes a kind of chirping noise at loud levels. This goes away when I shove my arm in the port thus making it smaller.
The box is kind of shaped like this, sort of a trapezoid.
volume of odd shaped box? -- posted image.
how do i find the volume of this shape?
bigjohnny 
Copper - Posts: 293
Copper spacespace
Joined: September 23, 2008
Location: Ontario, Canada
Posted: June 27, 2012 at 12:09 PM / IP Logged  
I think i just found a calculator here that will help me
EDIT
Nope, not quite the same....wouldn't give me accurate results.
i am an idiot 
Platinum - Posts: 13,694
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 27, 2012 at 1:23 PM / IP Logged  
Divide it up into rectangles and triangles. Or put some inside dimensions on the drawing, along with the inside width and tell us if it has a divider.
or buy enough shipping peanuts to fill the enclosure. Build a 1 cubic foot box and begin dumping the peanuts into the box. Count the number of times the peanuts fill the box.
bigjohnny 
Copper - Posts: 293
Copper spacespace
Joined: September 23, 2008
Location: Ontario, Canada
Posted: June 28, 2012 at 7:40 AM / IP Logged  
I think I got it.... I used the calculator available here. It occured to me that the angles themselves shouldn't make a difference to the volume if the measurements are correct, and this works out to 3 Cubic Feet.
so using the port calc, a port of 4" dia 9.25" long should be tuned to about 30Hz.

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