Thomas, Thanks for the detailed reply, much appreciated! Ok, so tighter bass, that's something I can relate to. I'll have to give it a try, I'm pretty sure I have plenty of foam and/or bonded polyester lying around here somewhere. $8 a square foot would definitely be out of my frugal budget...
Thomas, I'm curious, which sound characteristics are improved by the lining? Dickason shows only very minor changes between 0% lining/fill and 50% lining (five walls covered with 3" thick fiberglass), yet he says the 50% is a good choice because it has 'decreased response changes due to box...
Unless it's WinISD Pro, I believe the program does not compensate for port flares. As I understand it (someone correct me if I am wrong), a large flare tends to make the port appear longer than it really is. For example, say you have a 10" port that includes 2" of flare on each end, thus 6"...