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Need help with port dimensions
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<blockquote data-quote="bumpinne0n" data-source="post: 2016437" data-attributes="member: 567700"><p>I'm using this formula: LV=[(1.463 x 10^7 x R^2) / (Fb^2 x Vb)] - 1.463xR.</p><p></p><p>Where:</p><p></p><p>R=4.1889</p><p></p><p>Fb=32</p><p></p><p>Vb=5616 cu. in.</p><p></p><p>I end up with 38.5in.</p><p></p><p>I used this <a href="http://subwoofertools.com/forum/ported-box.asp?Ew=30&amp;Eh=13.75&amp;Dia=6&amp;Xmax=32&amp;Vd=.19&amp;NumW=1&amp;Vb=3.25&amp;Fb=32&amp;Qts=&amp;Vas=&amp;Fs=&amp;CE=0" target="_blank">http://subwoofertools.com/forum/ported-box.asp?Ew=30&amp;Eh=13.75&amp;Dia=6&amp;Xmax=32&amp;Vd=.19&amp;NumW=1&amp;Vb=3.25&amp;Fb=32&amp;Qts=&amp;Vas=&amp;Fs=&amp;CE=0</a></p><p></p><p>to see if I figured the port right. I did, but I don't understand why they're listing 38.5in. in length and then in the board dimensions, they list 19.5 x 12.25 in. for one piece and 12.25 x 12.25 in. for the other one, which comes out to 31.75 instead of the 38.5 which was what I thought it was supposed to be. I'd appreciate it if someone would explain this to me, I'd like to be able to design a box without using an online calculator. Thanks in advance.</p></blockquote><p></p>
[QUOTE="bumpinne0n, post: 2016437, member: 567700"] I'm using this formula: LV=[(1.463 x 10^7 x R^2) / (Fb^2 x Vb)] - 1.463xR. Where: R=4.1889 Fb=32 Vb=5616 cu. in. I end up with 38.5in. I used this [URL="http://subwoofertools.com/forum/ported-box.asp?Ew=30&Eh=13.75&Dia=6&Xmax=32&Vd=.19&NumW=1&Vb=3.25&Fb=32&Qts=&Vas=&Fs=&CE=0"]http://subwoofertools.com/forum/ported-box.asp?Ew=30&Eh=13.75&Dia=6&Xmax=32&Vd=.19&NumW=1&Vb=3.25&Fb=32&Qts=&Vas=&Fs=&CE=0[/URL] to see if I figured the port right. I did, but I don't understand why they're listing 38.5in. in length and then in the board dimensions, they list 19.5 x 12.25 in. for one piece and 12.25 x 12.25 in. for the other one, which comes out to 31.75 instead of the 38.5 which was what I thought it was supposed to be. I'd appreciate it if someone would explain this to me, I'd like to be able to design a box without using an online calculator. Thanks in advance. [/QUOTE]
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