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<blockquote data-quote="seth350" data-source="post: 1257882" data-attributes="member: 559168">Well Ive already cut all the pieces, but these numbers should be right.Here we go.......This is a ported box for my SX 15.As RE says, make it 3.5cuft @ 32hzI got these measurments 34&quot;x13x18&quot; and that gave me 3.56cuft net.I then calculated port disp. -Port is 32hzH-16.5&quot;W-3&quot;L-30.5&quot;Take the length and subtract .75 and then multiply by the height and then multiply by the width+.75 and then divide by 1728Which is 1.07cuft for the port disp.Sub Disp is 0.18cuft.Now, I have my net volume, and my displacements, now I need my gross volume and I get that by adding up the net and displacements.Which is3.56+1.07+0.18=4.81cuftSo my gross volume is 4.81 cuft.Now I adjusted my measurments to compensate for this.Which is now35.5&quot;x13&quot;x18&quot; = 4.807, and when you do significant figures it comes out to be 4.81cuft.Now, all I do is build to those measurements and that will give me 3.56 net in the box when I add port and sub, correct?</blockquote>

[QUOTE="seth350, post: 1257882, member: 559168"] Well Ive already cut all the pieces, but these numbers should be right. Here we go....... This is a ported box for my SX 15. As RE says, make it 3.5cuft @ 32hz I got these measurments 34"x13x18" and that gave me 3.56cuft net. I then calculated port disp. - Port is 32hz H-16.5" W-3" L-30.5" Take the length and subtract .75 and then multiply by the height and then multiply by the width+.75 and then divide by 1728 Which is 1.07cuft for the port disp. Sub Disp is 0.18cuft. Now, I have my net volume, and my displacements, now I need my gross volume and I get that by adding up the net and displacements. Which is 3.56+1.07+0.18=4.81cuft So my gross volume is 4.81 cuft. Now I adjusted my measurments to compensate for this. Which is now 35.5"x13"x18" = 4.807, and when you do significant figures it comes out to be 4.81cuft. Now, all I do is build to those measurements and that will give me 3.56 net in the box when I add port and sub, correct? [/QUOTE]

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