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<blockquote data-quote="xluben" data-source="post: 2022258" data-attributes="member: 568852"><p>it uses xmax, driver size, and tuning frequency/box volume to determine what the port velocity will be and makes the port large enough that there shouldn't be any port noise.</p><p></p><p>if you think you need more port area just change the xmax number. here's an example of how to get plans for a similar box with a 4" wide port:</p><p></p><p><a href="http://www.subwoofertools.com/forum/ported-box.asp?Ew=32&amp;Eh=19&amp;Dia=9&amp;Xmax=22&amp;Vd=.21&amp;NumW=1&amp;Vb=3.5&amp;Fb=35&amp;Qts=&amp;Vas=&amp;Fs=&amp;CE=0" target="_blank">http://www.subwoofertools.com/forum/ported-box.asp?Ew=32&amp;Eh=19&amp;Dia=9&amp;Xmax=22&amp;Vd=.21&amp;NumW=1&amp;Vb=3.5&amp;Fb=35&amp;Qts=&amp;Vas=&amp;Fs=&amp;CE=0</a></p></blockquote><p></p>
[QUOTE="xluben, post: 2022258, member: 568852"] it uses xmax, driver size, and tuning frequency/box volume to determine what the port velocity will be and makes the port large enough that there shouldn't be any port noise. if you think you need more port area just change the xmax number. here's an example of how to get plans for a similar box with a 4" wide port: [URL="http://www.subwoofertools.com/forum/ported-box.asp?Ew=32&Eh=19&Dia=9&Xmax=22&Vd=.21&NumW=1&Vb=3.5&Fb=35&Qts=&Vas=&Fs=&CE=0"]http://www.subwoofertools.com/forum/ported-box.asp?Ew=32&Eh=19&Dia=9&Xmax=22&Vd=.21&NumW=1&Vb=3.5&Fb=35&Qts=&Vas=&Fs=&CE=0[/URL] [/QUOTE]
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