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<blockquote data-quote="Bartak1" data-source="post: 902483" data-attributes="member: 557210">Alrighty, Im wanting to port the box for my Altas 12&#039;s and need someone to check over these numbers.I plan to use these Precision Ports from parts express<a href="http://www.partsexpress.com/pe/showdetl.cfm?&amp;amp;DID=7&amp;amp;Partnumber=268-352" target="_blank">http://www.partsexpress.com/pe/showdetl.cfm?&amp;amp;DID=7&amp;amp;Partnumber=268-352</a>Diameter is 4 inches, Flared End.My box is 1.9 Cu. Ft. per sub, separate chambers, which is equal to 53.8 liters per sub.That is WITHOUT driver and port displacment.Driver volume is 1.7 liters.Since these ports are 17 inches long, If I just put one in my box, 17 inches long, according to a calculator on LinearTeam.com this would give me right around 30 Hz, which is what I wanted.Could anyone double check these numbers to make sure they are right?I know this isnt the best box for one of these, but its all i have to work with,and I put the specs in on WinISD and it looked ok I think on the low Qts. setting.So if someone can check these that would be awsome.&nbsp; Thanks</blockquote>

[QUOTE="Bartak1, post: 902483, member: 557210"] Alrighty, Im wanting to port the box for my Altas 12's and need someone to check over these numbers. I plan to use these Precision Ports from parts express [URL="http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=268-352"]http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=268-352[/URL] Diameter is 4 inches, Flared End. My box is 1.9 Cu. Ft. per sub, separate chambers, which is equal to 53.8 liters per sub. That is WITHOUT driver and port displacment. Driver volume is 1.7 liters. Since these ports are 17 inches long, If I just put one in my box, 17 inches long, according to a calculator on LinearTeam.com this would give me right around 30 Hz, which is what I wanted. Could anyone double check these numbers to make sure they are right? I know this isnt the best box for one of these, but its all i have to work with,and I put the specs in on WinISD and it looked ok I think on the low Qts. setting. So if someone can check these that would be awsome. Thanks [/QUOTE]

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