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<blockquote data-quote="xluben" data-source="post: 1984565" data-attributes="member: 568852">yeah, you need to use net volume when calculating the tuning, so it&#039;s kind of a back and forth until you figure out what you want.i don&#039;t think you can do better than 2.9 cu ft @ 36Hz with a 4&quot;x 12&quot; port.here ya go:<a href="http://www.subwoofertools.com/forum/ported-box.asp?Ew=40.25&amp;amp;Eh=13.5&amp;amp;Dia=5&amp;amp;Xmax=12.5&amp;amp;Vd=.1&amp;amp;NumW=2&amp;amp;Vb=2.9&amp;amp;Fb=36&amp;amp;Qts=&amp;amp;Vas=&amp;amp;Fs=&amp;amp;CE=0" target="_blank">http://www.subwoofertools.com/forum/ported-box.asp?Ew=40.25&amp;amp;Eh=13.5&amp;amp;Dia=5&amp;amp;Xmax=12.5&amp;amp;Vd=.1&amp;amp;NumW=2&amp;amp;Vb=2.9&amp;amp;Fb=36&amp;amp;Qts=&amp;amp;Vas=&amp;amp;Fs=&amp;amp;CE=0</a>EDIT: nevermind, i thought you were re-doing the other box too.how long did you end up making the port?(make sure you measure like this: <a href="http://mobile.jlaudio.com/support_pages.php?page_id=165" target="_blank">port info</a> )or, to not confuse you, how long is the second part of the port wall (after the bend) ?sorry i wasn&#039;t around this afternoon to help with the calculations, i was still at work //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gifcan&#039;t wait to hear your new and improved box (and mine!).</blockquote>

[QUOTE="xluben, post: 1984565, member: 568852"] yeah, you need to use net volume when calculating the tuning, so it's kind of a back and forth until you figure out what you want. i don't think you can do better than 2.9 cu ft @ 36Hz with a 4"x 12" port. here ya go: [URL="http://www.subwoofertools.com/forum/ported-box.asp?Ew=40.25&Eh=13.5&Dia=5&Xmax=12.5&Vd=.1&NumW=2&Vb=2.9&Fb=36&Qts=&Vas=&Fs=&CE=0"]http://www.subwoofertools.com/forum/ported-box.asp?Ew=40.25&Eh=13.5&Dia=5&Xmax=12.5&Vd=.1&NumW=2&Vb=2.9&Fb=36&Qts=&Vas=&Fs=&CE=0[/URL] EDIT: nevermind, i thought you were re-doing the other box too. how long did you end up making the port? (make sure you measure like this: [URL="http://mobile.jlaudio.com/support_pages.php?page_id=165"]port info[/URL] ) or, to not confuse you, how long is the second part of the port wall (after the bend) ? sorry i wasn't around this afternoon to help with the calculations, i was still at work [IMG]//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif[/IMG] can't wait to hear your new and improved box (and mine!). [/QUOTE]

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