Port area ? Need help plz!!!!!

[Port area ? Need help plz!!!!!]

That is each

[Port area ? Need help plz!!!!!]

Ok well i put in the sub size (15) . Then I put in the amount of woofers (2) . Then I put in the xmax of my subs (40mm) . Then i put in the tuning which is 45 and it came up with that number

[Port area ? Need help plz!!!!!]

Well I just tried using http://www.carstereo.com/help/Articles.cfm?id=31 and its telling me to use 366.38 inches . What are they meaning by this ? Is this the recommendation towards the amount of port area ?

[Port area ? Need help plz!!!!!]

Ok well I have a few questions when it comes to the proper way to decide on the amount of port are that you should use when it comes to designing ported boxes and 4th order enclosures . I have been hearing mixed " opinions " when it comes to picking the amount of port area needed . The most common way I have heard about is staying in between 12 - 16 sq inches of port per cube. Which in my opinion is not a very accurate way to design an enclosure . The other way that have been told is that you adjust your port area according to the xmax or linear max on your woofer. Which sounds to be a more accurate way in to better suit a build. So if anyone knows the actual proper way to determine port are plz inform me.

Thank you ,

Christopher Murray