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<blockquote data-quote="Ryan S" data-source="post: 3681154" data-attributes="member: 583958">I&#039;ll have an internal volume of 1.64ft^3 per sub, which is what Alpine calls ideal for ported.I was planning using PVC for my ports, just needed to clarify I could change the port shape without adversely affecting sound too much and how to calculate it...because if each sub requires a displacement of .305ft^5, I would need six(6) PVC ports that are 3&#039;&#039; in diameter and at a 12&#039;&#039; length. //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gifUnless my math is wrong?&nbsp; Can anyone help?&nbsp; //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gifHere&#039;s what Alpine says for a vented box (I can only go 12&#039;&#039; long per port):<img src="http://xs322.xs.to/xs322/07524/asdf.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="Ryan S, post: 3681154, member: 583958"] I'll have an internal volume of 1.64ft^3 per sub, which is what Alpine calls ideal for ported. I was planning using PVC for my ports, just needed to clarify I could change the port shape without adversely affecting sound too much and how to calculate it...because if each sub requires a displacement of .305ft^5, I would need six(6) PVC ports that are 3'' in diameter and at a 12'' length. [IMG]//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif[/IMG] Unless my math is wrong? Can anyone help? [IMG]//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif[/IMG] Here's what Alpine says for a vented box (I can only go 12'' long per port): [IMG]http://xs322.xs.to/xs322/07524/asdf.jpg[/IMG] [/QUOTE]

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