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Pete, the sonotube im using for a port is only 1/8" thick, so you mean just subtract the material of the port inside the box, not all the air volume inside the port? Craig

Hey, i finished my box for my BPD 1803.. After I subtract all the bracing/driver/etc i have a net enclosure of 11.302 ft3. I want to tune it to 17.5hz and the inside diameter of the sonotube port I will be using is 8.25". I come up with a port 35" long, does that look about right? How do you...