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<blockquote data-quote="Jeffdachef" data-source="post: 8283198" data-attributes="member: 650438">its 6 inch ports for the 2nd one too three of them. Difference between the first one and the 2nd one is, the 2nd has much more adequate port area. I&#039;m using win ISD atm and trying to get a proper cross area between 79.1 and 101.7 so the sub would breath properly and have minimal port noise, following the&nbsp; &quot;14-16&nbsp;&nbsp; multiply by&nbsp;&nbsp; Box volume&quot;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; rule for port area.The box by itself without accounting port area is 5.65 cubic feet. If you want to follow that rule then assuming you&#039;ve added enough bracing so its 5.2 cubic feet then you can go with two 7 inch aeroports each 13&quot; long, gives you close to a proper cross area and same tuning. Final box volume will be 4.6 cubic feet after brace and port area only draw back about that is, its kinda hard to find 7 inch pvc pipes.if we want to make it work following that rule then we&#039;ll need to shorten the depth of the box and sacrifice some airspace.</blockquote>

[QUOTE="Jeffdachef, post: 8283198, member: 650438"] its 6 inch ports for the 2nd one too three of them. Difference between the first one and the 2nd one is, the 2nd has much more adequate port area. I'm using win ISD atm and trying to get a proper cross area between 79.1 and 101.7 so the sub would breath properly and have minimal port noise, following the "14-16 multiply by Box volume" rule for port area. The box by itself without accounting port area is 5.65 cubic feet. If you want to follow that rule then assuming you've added enough bracing so its 5.2 cubic feet then you can go with two 7 inch aeroports each 13" long, gives you close to a proper cross area and same tuning. Final box volume will be 4.6 cubic feet after brace and port area only draw back about that is, its kinda hard to find 7 inch pvc pipes. if we want to make it work following that rule then we'll need to shorten the depth of the box and sacrifice some airspace. [/QUOTE]

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