Been a long time lurker but this is my first post. I built a sealed 122L tempest. I am going to build a ported enclosure for it also just to see which I like better. I have decided on the SBB4 design from adire's website. The mistake I made was that I bought 4 in PVC from the Local Home Depot and when I got home I plugged the numbers into my enclosure design programs and they said I needed 2 25 in ports. Thats a lot bigger than the 2 3 by 5 in ports that adire says to use. Am I doing something wrong or is that accurate. Is there anyhing I can adjust to decrease the port length. I would just get new ports but the wife is starting to disapprove of the amount of money spent on this project already and I still need to buld my flexy rack . I have always built sealed boxes and this is my first ported so I would like to do it right. Thanks in advanced.