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<blockquote data-quote="dinty01" data-source="post: 2628626" data-attributes="member: 567850">well, you add those 2 numbers then divide by 2 to get the depth, you do this so that(in theory) the front of the box would be straight, not a slant so it is easier to calculate the internal cuft of the box. For the center section I added the 8&quot;(bottom) and 5.5 &quot;(top) to get 13.50&quot;, then divided that by 2 to get 6.75&quot; deep, then multiplis 6.75x12x14 and got 1134, then divide that number by 1728(use this number when calculating internal volume in cubic feet) and got 0.66 cuft, then added that to the 3.73 cu ft to get 4.39 cubic feet internal volume(this is the gross internal volume in cubic feet).The sub displacement is how much volume the woofer takes up inside the box when it inside the box. With your woofer there should be a spec sheet(if not you can probably find the specs online) and there will be a displacement figure for each woofer(and it is usually in cubic feet already so no need to recalculate it), you then subtract that number from the gross internal volume to get your actual volume inside the box in cubic feet. If you have 2 woofers then add the displacement twice then subtract that number from the gross volume figure. I dont know what woofers you are using but if you have a spec sheet and find the displacement post it here and Ill show you how to do it if you want----DintyBTW if I am wrong with these figures please feel free to correct me, Im no master fabricator, just going by my personal experience.</blockquote>

[QUOTE="dinty01, post: 2628626, member: 567850"] well, you add those 2 numbers then divide by 2 to get the depth, you do this so that(in theory) the front of the box would be straight, not a slant so it is easier to calculate the internal cuft of the box. For the center section I added the 8"(bottom) and 5.5 "(top) to get 13.50", then divided that by 2 to get 6.75" deep, then multiplis 6.75x12x14 and got 1134, then divide that number by 1728(use this number when calculating internal volume in cubic feet) and got 0.66 cuft, then added that to the 3.73 cu ft to get 4.39 cubic feet internal volume(this is the gross internal volume in cubic feet). The sub displacement is how much volume the woofer takes up inside the box when it inside the box. With your woofer there should be a spec sheet(if not you can probably find the specs online) and there will be a displacement figure for each woofer(and it is usually in cubic feet already so no need to recalculate it), you then subtract that number from the gross internal volume to get your actual volume inside the box in cubic feet. If you have 2 woofers then add the displacement twice then subtract that number from the gross volume figure. I dont know what woofers you are using but if you have a spec sheet and find the displacement post it here and Ill show you how to do it if you want----Dinty BTW if I am wrong with these figures please feel free to correct me, Im no master fabricator, just going by my personal experience. [/QUOTE]

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