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https://www.stevemeadedesigns.com/board/topic/209127-triticums-improved-port-area-calculator/
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Note to mobile users! If you are trying to use this from your phone you probably won't be able to edit the fields from your web browser. To get it to work right you need to download the Google Sheets app and edit the document from within the app.
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Enter data here↓:
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Net Volume of Enclosure:2ft³
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Total Input Power:500Watts
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Tuning Frequency:28Hz
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Watts per Cubic Foot250 W per ft³
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Minimum Port Area Required (Slot Port)18 in² Total
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Minimum Port Area per ft³ (Slot Port)8.9 in² per ft³
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Minimum Port Area Required (Aero Port)16 in² Total
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Minimum Port Area per ft³ (Aero Port)8.1 in² per ft³
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Optimal Port Area Required (Slot & Aero)
24 in² Total
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Optimal Port Area per ft³ (Slot & Aero)12.1 in² per ft³
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Information:
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This calculator will determine how much port area you need based on the size of the enclosure, how much total input power you will be using, and the tuning frequency. This should result in much more accurate results than the "port area per cube" guideline that has been floating around the Internet forever.
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Please Note: These formulas are intended for car audio use. For home audio use more port area is usually desired to reduce the chances of getting port noise.
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The "Minimum Port Area Required" result is how much port area you will need to keep port velocity under about 30 meter per second for slot ports and 32 meters per second for aero (or other round) ports. Port velocities above these numbers are where serious port compression sets in and you begin to lose a LOT of output. When using the minimum port area required you will STILL be losing SOME output to port compression.
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The "Optimal Port Area Required" result is how much port area you need to keep port velocity under about 22 meters per second. This should prevent port noise under most situations and will result in less output loss to port compression compared to the "Minimum Port Area Required" recommendation. Since you will have more port area with this formula the port will need to be longer to keep enclosure tuning the same, under many high power situations this may result in a port that is too long to be feasible (I don't like anything over 44"). At that point you will just have to do the best you can to strike a balance between having as much port area as possible and keep the port length a reasonable size.
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For bandpass boxes I highly recommend you use the "Optimal" port area value. Due to bandpass boxes' higher tuning frequencies port length is much less of an issue and since ALL the output is coming out the port it is much more important there is as little port compression as possible.
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For more information on how and why this was developed please take a look at this forum:
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https://www.stevemeadedesigns.com/board/topic/209127-triticums-improved-port-area-calculator/
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