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Yet Another Box Building Thread
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<blockquote data-quote="RealAlan" data-source="post: 7735825" data-attributes="member: 641630"><p>What you have is a trapezoid to figure volume for a trapezoid:</p><p></p><p>First convert all your values to feet by dividing by 12.</p><p></p><p>volume = L * (b1 + (b2 - b1) * h1 / h + b1) * h1 / 2</p><p></p><p>In your case here are the values converted:</p><p></p><p>L= 16 = 1.334</p><p></p><p>h=14 = 1.167</p><p></p><p>h1=7 = .583</p><p></p><p>b1=4 =.333</p><p></p><p>b2=10 = .833</p><p></p><p>Google "calculate volume of a trapezoid" enter the values and you get:</p><p></p><p>.36 cu ft.</p><p></p><p>Your Vas: 3.00 cu. ft.</p><p></p><p>This is the size you want your box volume to be</p><p></p><p>Vas = Volume Air Space</p><p></p><p>at either .36 or .58 cu. ft. it is to small</p><p></p><p>I found this site very helpful:</p><p></p><p><a href="http://www.bcae1.com/spboxnew2.htm" target="_blank">http://www.bcae1.com/spboxnew2.htm</a></p><p></p><p>Your dimensions need to be more like</p><p></p><p>H = 18"</p><p></p><p>L = 24"</p><p></p><p>D1 = 8"</p><p></p><p>D2 = 16"</p><p></p><p>Were talking a 12" sub here not a 6-1/2" woofer</p><p></p><p>which is the original dimensions you give for.</p></blockquote><p></p>
[QUOTE="RealAlan, post: 7735825, member: 641630"] What you have is a trapezoid to figure volume for a trapezoid: First convert all your values to feet by dividing by 12. volume = L * (b1 + (b2 - b1) * h1 / h + b1) * h1 / 2 In your case here are the values converted: L= 16 = 1.334 h=14 = 1.167 h1=7 = .583 b1=4 =.333 b2=10 = .833 Google "calculate volume of a trapezoid" enter the values and you get: .36 cu ft. Your Vas: 3.00 cu. ft. This is the size you want your box volume to be Vas = Volume Air Space at either .36 or .58 cu. ft. it is to small I found this site very helpful: [URL="http://www.bcae1.com/spboxnew2.htm"]http://www.bcae1.com/spboxnew2.htm[/URL] Your dimensions need to be more like H = 18" L = 24" D1 = 8" D2 = 16" Were talking a 12" sub here not a 6-1/2" woofer which is the original dimensions you give for. [/QUOTE]
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