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<blockquote data-quote="RAM_Designs" data-source="post: 6586642" data-attributes="member: 566575">You use net box volume to find port length, not gross volume.&nbsp; The way I do it is, let&#039;s say I have 6ft^3 to work with for a pair of 12&#039;s, and I already know my dimensions that I&#039;m using.&nbsp; Basically I set aside a certain amount of volume for the port, which for something like this will be in the 1.5ft^3 range so that I can keep the net box volume that I&#039;d need after all displacements.&nbsp; So now I know that I&#039;m using 4.5ft^3 tuned to whatever I want, so I just tinker with port dimensions until I find a length that gives me the amount of displacement I need, in this case 1.5ft^3...and voila.Also, in your argument, the program would have no idea how to account for the port that you may be building.&nbsp; There are too many other variables that will determine how much space your port is taking up(ie: thickness of wood, doubled up port walls, number of exposed sides inside the box, turns, etc.).</blockquote>

[QUOTE="RAM_Designs, post: 6586642, member: 566575"] You use net box volume to find port length, not gross volume. The way I do it is, let's say I have 6ft^3 to work with for a pair of 12's, and I already know my dimensions that I'm using. Basically I set aside a certain amount of volume for the port, which for something like this will be in the 1.5ft^3 range so that I can keep the net box volume that I'd need after all displacements. So now I know that I'm using 4.5ft^3 tuned to whatever I want, so I just tinker with port dimensions until I find a length that gives me the amount of displacement I need, in this case 1.5ft^3...and voila. Also, in your argument, the program would have no idea how to account for the port that you may be building. There are too many other variables that will determine how much space your port is taking up(ie: thickness of wood, doubled up port walls, number of exposed sides inside the box, turns, etc.). [/QUOTE]

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