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<blockquote data-quote="mvw2" data-source="post: 3611509" data-attributes="member: 574722">Model up the sub using WinISD or a Excel spreadsheet like Unibox or one from <a href="http://www.DIYSubwoofers.org(have" target="_blank">http://www.DIYSubwoofers.org(have</a> come to like this one).Model up the sub for both sealed and ported.&nbsp; Know the ideal size and port tune.Make a note of how much excursion is used at the power you have.&nbsp; For example, the sub may have 15mm xmax but you may only use 9mm in the ported enclosure off the 500w you have.&nbsp; Make a note of how much excursion is actually used.Go to CarStereo&#039;s port calculator:<a href="http://www.carstereo.com/help/Articles.cfm?id=31" target="_blank">http://www.carstereo.com/help/Articles.cfm?id=31</a>Tell it the sub size, the tuning frequency and the excursion used.&nbsp; It will tell you how much port area you need to not have it be noisy.&nbsp; After that, you have the option of making a standard round port, square port, or slotted port.&nbsp; Shoot for the same area as was suggested by the top half portion of the calcuator.&nbsp; Make note of diameter(if round) or heightxwidth if slotted.&nbsp; The caclulator will figure out port length based off the tuning frequency and box size.Then just build the box.&nbsp; The end result will be far better than any prefab because it will actually be designed for that sub.</blockquote>

[QUOTE="mvw2, post: 3611509, member: 574722"] Model up the sub using WinISD or a Excel spreadsheet like Unibox or one from [URL="http://www.DIYSubwoofers.org(have"]http://www.DIYSubwoofers.org(have[/URL] come to like this one). Model up the sub for both sealed and ported. Know the ideal size and port tune. Make a note of how much excursion is used at the power you have. For example, the sub may have 15mm xmax but you may only use 9mm in the ported enclosure off the 500w you have. Make a note of how much excursion is actually used. Go to CarStereo's port calculator: [URL="http://www.carstereo.com/help/Articles.cfm?id=31"]http://www.carstereo.com/help/Articles.cfm?id=31[/URL] Tell it the sub size, the tuning frequency and the excursion used. It will tell you how much port area you need to not have it be noisy. After that, you have the option of making a standard round port, square port, or slotted port. Shoot for the same area as was suggested by the top half portion of the calcuator. Make note of diameter(if round) or heightxwidth if slotted. The caclulator will figure out port length based off the tuning frequency and box size. Then just build the box. The end result will be far better than any prefab because it will actually be designed [I]for[/I] that sub. [/QUOTE]

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