Background: I've had a Shiva tucked away for some time now (since the initial HTF deal). It took me some time to find the tube at a reasonable price and then some additional time to actually drive to the place. When all the projects started creeping up, and I was regularly reading this section of the forum, it seems like the only thing that was around for free was WinISD. My initial plans were based on this (and a heavy dose of the Ron S. end table model here http://www.hometheaterhifi.com/volum...tember-99.html ). Now there's this thing on the Adire site that I downloaded, but it really doesn't make a whole lot of sense to me. Now then: The project finally got underway today. I've got a 26" length of 24" dia. tube cut as well as 4 internal end cap pieces from 3/4" MDF. This leaves 23" of internal tube (10405 in^3). The plan was to have dual 4" (already have the pipe, so please no suggestions for different sizes) ports and a tune around 21hz. If I'm to believe WinISD the ports will have to be 23-24" each for a fairly flat curve -3db around 20hz. I was planning to get the port flares from Madisound (although I'm not sure what exactly these look like from the nonexistent description on the site - do they have a clear inner and outer piece for each set?). SOOOOO . . . what do the experts think about all this, what alterations are necessary in port length for the flares and/or bends in the port structure, and what about stuffing? Thanks for the help! P.S. I mentioned that I haven't been following this area for some time, and I figured it was easier to give my specific ideas/questions rather than searching endlessly for something that may or may not apply in another thread. If someone knows a specific thread that might help, let me know.