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<blockquote data-quote="RAM_Designs" data-source="post: 6586678" data-attributes="member: 566575">I already answered that.As for my evidence: <a href="http://74.125.47.132/search?q=cache:mriChcANXMIJ:www.clubknowledge.com/Car_Audio_FAQ/archives/4633.html+use+net+volume+to+determine+port+length&amp;amp;cd=4&amp;amp;hl=en&amp;amp;ct=clnk&amp;amp;gl=us" target="_blank">http://74.125.47.132/search?q=cache:mriChcANXMIJ:www.clubknowledge.com/Car_Audio_FAQ/archives/4633.html+use+net+volume+to+determine+port+length&amp;amp;cd=4&amp;amp;hl=en&amp;amp;ct=clnk&amp;amp;gl=us</a>&quot;We use Vb. Vb is the net box volume of airspace inside the box, after we subtract sub and port displacement values. &quot;&quot;In all of these formulas to calculate port length, you&#039;re supposed to use the net internal volume.&quot;It&#039;s also good to use common sense.&nbsp; If you think that you are supposed to use box volume before port displacement, then I can come up with a design that will yield negative box volume.&nbsp; How about a 1ft^3 box uned to 20hz with an 8&quot; aeroport?&nbsp; It&#039;ll need to be 332&quot; long, which as I&#039;m sure you know will be more than 1ft^3 worth of displacement.&nbsp; A program cannot account for things like this, or what I mentioned before about variables that are involved with the port itself.</blockquote>

[QUOTE="RAM_Designs, post: 6586678, member: 566575"] I already answered that. As for my evidence: [URL="http://74.125.47.132/search?q=cache:mriChcANXMIJ:www.clubknowledge.com/Car_Audio_FAQ/archives/4633.html+use+net+volume+to+determine+port+length&cd=4&hl=en&ct=clnk&gl=us"]http://74.125.47.132/search?q=cache:mriChcANXMIJ:www.clubknowledge.com/Car_Audio_FAQ/archives/4633.html+use+net+volume+to+determine+port+length&cd=4&hl=en&ct=clnk&gl=us[/URL] "We use Vb. Vb is the net box volume of airspace inside the box, after we subtract sub and port displacement values. " "In all of these formulas to calculate port length, you're supposed to use the net internal volume." It's also good to use common sense. If you think that you are supposed to use box volume before port displacement, then I can come up with a design that will yield negative box volume. How about a 1ft^3 box uned to 20hz with an 8" aeroport? It'll need to be 332" long, which as I'm sure you know will be more than 1ft^3 worth of displacement. A program cannot account for things like this, or what I mentioned before about variables that are involved with the port itself. [/QUOTE]

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