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<blockquote data-quote="sean8811" data-source="post: 8291111" data-attributes="member: 661697">Needing*** ^^^Hello all,So I am trying to design two subwoofer boxes. I have all my measurements for my trunk laid out and all of the specs for my subwoofers. They are infinity kappa 120.9w run in parallel at 400 watts each off a infinity kappa one.Any who I downloaded winisd pro. Infinity says the subs are at 27.20 htz but the sub box layout that comes with the sub calls for a round port 4 inch in diameter and 13 5/16 long fb=30htz.So there is the first confusion.Then on winisd the port dimensions on that are way touchy. Bigger the port hole the longer. Smaller port hole the shorter?Then rear port velocity seems to be low and I can get it pretty low about 15 through 20 feet per second or whatever.&nbsp; But on the X max part it says my sub over excursions below the targeted tuned frequency? I&#039;m so confused.&nbsp; LolPlease help!</blockquote>

[QUOTE="sean8811, post: 8291111, member: 661697"] Needing*** ^^^ Hello all, So I am trying to design two subwoofer boxes. I have all my measurements for my trunk laid out and all of the specs for my subwoofers. They are infinity kappa 120.9w run in parallel at 400 watts each off a infinity kappa one. Any who I downloaded winisd pro. Infinity says the subs are at 27.20 htz but the sub box layout that comes with the sub calls for a round port 4 inch in diameter and 13 5/16 long fb=30htz. So there is the first confusion. Then on winisd the port dimensions on that are way touchy. Bigger the port hole the longer. Smaller port hole the shorter? Then rear port velocity seems to be low and I can get it pretty low about 15 through 20 feet per second or whatever. But on the X max part it says my sub over excursions below the targeted tuned frequency? I'm so confused. Lol Please help! [/QUOTE]

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