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<blockquote data-quote="Trixter" data-source="post: 2103675" data-attributes="member: 542668">the length of the port depends on the port area. the mfg usually has a recommendation for this. i&#039;m not familiar with eclipse subs so i don&#039;t want to give out any numbers. but once you find the area you need, then figure out it&#039;s length. if your doing a slot port that shares a common wall with the box you need to add 1/2 of the ports width to it&#039;s length, this is called port correction factor. once you add the correction to the previous calculated length, you get you total length. now you need to figure out the port displacement. remember to include all material that makes the port. (example: if the port is 2&quot;w x 14&quot;t x 28&quot;l then the displacement numbers would be, assuming your using 3/4&quot; material, 2.75&quot; x 14 x 27.25&quot;. the .75 added to the 2 is for one wall of the port, if the other is shared with the box. the 14 stays 14 and the 28 becomes 27.25 because you don&#039;t count the front face of the box...you alreay did by taking the internal measurements of the box before.) now that you have the port displacment add this volume to the box net volume and build from there. just remember that this volume is internal. so, if using 3/4 material, add 1.5&quot; to each dimension and that will be your build size.hope this helps.</blockquote>

[QUOTE="Trixter, post: 2103675, member: 542668"] the length of the port depends on the port area. the mfg usually has a recommendation for this. i'm not familiar with eclipse subs so i don't want to give out any numbers. but once you find the area you need, then figure out it's length. if your doing a slot port that shares a common wall with the box you need to add 1/2 of the ports width to it's length, this is called port correction factor. once you add the correction to the previous calculated length, you get you total length. now you need to figure out the port displacement. remember to include all material that makes the port. (example: if the port is 2"w x 14"t x 28"l then the displacement numbers would be, assuming your using 3/4" material, 2.75" x 14 x 27.25". the .75 added to the 2 is for one wall of the port, if the other is shared with the box. the 14 stays 14 and the 28 becomes 27.25 because you don't count the front face of the box...you alreay did by taking the internal measurements of the box before.) now that you have the port displacment add this volume to the box net volume and build from there. just remember that this volume is internal. so, if using 3/4 material, add 1.5" to each dimension and that will be your build size. hope this helps. [/QUOTE]

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