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13th March 2013, 01:05 AM  #31 
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Join Date: Jun 2011
Location: Canton Michigan


13th March 2013, 01:07 AM  #32  
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Join Date: Oct 2012
Location: Virginia

Quote:


13th March 2013, 01:16 AM  #33  
diyAudio Member
Join Date: Jun 2011
Location: Canton Michigan

Quote:
Sorry the first set of numbers were an example and trying and get the ball rolling and helping me out? Duhhhh? I feel like a big dummy. I should have told you the right box dimensions a mistake on my part. As for the drawings they are long gone. Now I have to cut the boxe sides off to see how I built them. I have forgotten and I have been thru the mill this last year been ruff. Jeff 

13th March 2013, 01:38 AM  #34 
frugalphile(tm)
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((Area at the top)+(Area at the bottom))/2 x height = volume
dave
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13th March 2013, 03:06 AM  #35 
diyAudio Member
Join Date: Feb 2013

It's not that difficult, but in order to simplify things:
Online Conversion  Volume of a Trapezoid tank Volume of a Rectangular Trapezoidal Trough 
13th March 2013, 04:25 AM  #36 
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Join Date: Oct 2012
Location: Virginia

Technically, the divide by two should be into the sum of the top and bottom areas (parenthesis div by 2) to get the average area x height, which is the same as what I said in post 3 and all along. And it works for any prismatic shape with parallel top and bottoms and prism can be skewed to side and doesn't have to be straight up and it still works. Very simple formula. Planet10 and I agree.

13th March 2013, 08:24 PM  #38 
diyAudio Member
Join Date: Jun 2011
Location: Canton Michigan

A big Thank you to everyone in helping me out. It helps me out a lot and it keeps me going on my speaker projects. So please see if I got this right below? It's my first time doing this kinda math.
So here go's let see if I get this right? ( 5 + 8 * into 2 = 6.5 x 40 = 260. So is this right? (or is it 5+5+8+8 = 26 * 2 = 13 x 40 = 520?) Last edited by cross reference; 13th March 2013 at 08:45 PM. 
13th March 2013, 10:06 PM  #39  
diyAudio Member
Join Date: Oct 2012
Location: Virginia

Quote:
Based on your earlier post it would seem that the top lid is a rectangle 2 x 6 inches and the bottom panel is a rectangle 10 x 11 inches right? And the height is 40 inches? Using the formula that Dave and I stated above: Average of area of top and bottom x height = (area_top + area_bottom)/2 x height, area_top = 2x6 square inches, area_bottom = 10x11 square inches, or (2x6 + 10x11)/2 x 40 = (12+110)/2 x 40 = 122/2 x 40 = 61 x 40 = 2440 cubic inches. 2440cu in / 1728 cu in per cu ft = 1.412 cubic feet 

13th March 2013, 10:28 PM  #40  
diyAudio Member
Join Date: Jun 2011
Location: Canton Michigan

Quote:
The numbers 5 and 8 have to do with a box I just cut out a few days ago. Nothing to do with this project. I just had my head in another area. Yes your correct about 2x 6 and 11 and 12 and 40. Thanks again I understand now. Jeff Last edited by cross reference; 13th March 2013 at 10:33 PM. 

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