There you are,
I have some quick information for you which i copied from another thread and store it in my documentation.
It's an explanation from BGavin, a well known member from TB and also with a lot of knowledge of speakercab building(thanks to him anyway)
I never build this cab or have any experiance with this driver, so I can't tell you anything how it will performs.
Start with a cube cabinet, internals are 13.67" inches.
This is 1.48 cubic feet.
The 2510-II displaces 0.026 cubic feet.
When you install the driver into the cabinet, the net volume is 1.48 - 0.026 = 1.454 cubic feet.
Next, install a big round ducted port.
7.622" inside diameter, wall thickness 0.3", total diameter = 8.22".
Make the duct 6.5" long.
The external volume displaced by the duct is 0.20 cubic feet.
This duct is inside the cabinet, so it reduces the net volume by 0.20 cubic feet.
The net volume is reduced a total of (0.026 + 0.20) cubic feet.
You have to make the box larger to get back to the desired 1.48 cubic feet net volume.
This is 1.48 + 0.026 + 0.20 = 1.706 cubic feet.
Doing the math again:
1.706 - 0.026 (driver) - 0.20 (duct) = 1.48 cubic feet net volume.