The RE box calculator is worthless. With your box dimensions you need to calculate the enclosure volume taking into consideration the wood thickness, displacement of the driver, any bracing displacement, and port displacement. You also need to make sure your port area is adequate so you don't run into port noise. You also need to make sure your port length is correct for the desired tuning AND it's being calculated with the correct volume of the enclosure. IE: the enclosure has an internal volume of 2 cubes. The sub has a displacement of 0.15cubes, so the internal volume is now 1.85 cubes. Say you want 30hz tuning and need 30in^2 of port area, and that calls for 15" of port length (these numbers are arbitrary) for 1.85cubes of volume, but the port itself displaces ~0.26 cubes, so your actual volume would be 1.59 not 1.85, which means the port length of 15" would actually raise the tuning, and you'd need to increase the port length to bring it back down to 30hz. It's really not that hard as long as you know some basic math and have the ability to search around for what constitutes adequate port area. It's also worth mentioning the above isn't even touching the subject of picking what enclosure volume and/or tuning would be best for an application, but rather just making a basic box. I hope you design and build the enclosure all by yourself, that way perhaps you'll better appreciate the amount of work that goes into such and I won't have to read another one of your posts whining about peoples' pricing. P.S. The RE calculator is worthless. If you use it and your box sucks, I told you so.