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No more money for PR unfortunately. I did change a few things that may help. If I go with the 5.51" vent, WinISD says my port will need to be 19.67" long. I have 23" inside the box to work with. Questions are: 1) Is 5.51 = the ID of 6" PVC? 2) A 6" flared port was recommended; can I...

Thanks to the wealth of knowledge contained in this forum, I have begun construction on my first sub; a ported AV-15! If you care to take a look at the progress, a few pics can be found here: link. Now for the questions: I've been using WinISD Pro for my calculations. However, I'm confused...