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<blockquote data-quote="Moble Enclosurs" data-source="post: 7460373" data-attributes="member: 634917">Considering that this driver has a usable throw of 3&quot; and the LF cutoff of music is around 30Hz, the minimum area you want to have for a port is 539.67 square cm. This will equate to about a 10&quot; port diameter. But again, this would be the minimum for a power related, excursion related, and frequency related figure of max. SO, anything above 30Hz and less than 76.2mm of excursion will be well below port noise. This will also be if tuning(in a conventional design) is around 30Hz. This gives virtually zero port noise, a fraction of average. For somewhat of a higher port noise for less coupling and added pressure, the 4&quot; port will give you a minimum port noise around a 45Hz tuned enclosure. Anything below 45Hz will start to give you significant amount of pressure(which will be a good thing up to a point of max allowable port noise).Hope that helps.</blockquote>

[QUOTE="Moble Enclosurs, post: 7460373, member: 634917"] Considering that this driver has a usable throw of 3" and the LF cutoff of music is around 30Hz, the minimum area you want to have for a port is 539.67 square cm. This will equate to about a 10" port diameter. But again, this would be the minimum for a power related, excursion related, and frequency related figure of max. SO, anything above 30Hz and less than 76.2mm of excursion will be well below port noise. This will also be if tuning(in a conventional design) is around 30Hz. This gives virtually zero port noise, a fraction of average. For somewhat of a higher port noise for less coupling and added pressure, the 4" port will give you a minimum port noise around a 45Hz tuned enclosure. Anything below 45Hz will start to give you significant amount of pressure(which will be a good thing up to a point of max allowable port noise). Hope that helps. [/QUOTE]

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