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<blockquote data-quote="RealAlan" data-source="post: 7735825" data-attributes="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 / 2In your case here are the values converted:L= 16 = 1.334h=14 = 1.167h1=7 = .583b1=4 =.333b2=10 = .833Google &quot;calculate volume of a trapezoid&quot; 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 beVas = Volume Air Spaceat either .36 or .58 cu. ft. it is to smallI found this site very helpful:<a href="http://www.bcae1.com/spboxnew2.htm" target="_blank">http://www.bcae1.com/spboxnew2.htm</a>Your dimensions need to be more likeH = 18&quot;L =&nbsp; 24&quot;D1 = 8&quot;D2 = 16&quot;Were talking a 12&quot; sub here not a 6-1/2&quot; wooferwhich is the original dimensions you give for.</blockquote>

[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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