bunch of sub box

I have a couple of random questions about sub enclosures. 1) Is there ever too much cross sectional of a vent for a vented enclosure. I know that if you have too small of a cross sectional area the air velocity is high but is there anything wrong with too large a cross sectional area? When I have used WinISD to find the air velocity I have been trying to make it as low as possible while being resonable. 2) What are tranmission line enclosures? Is there some links about the basics of them. What are the pros and cons? I know that they take up a lot of space but they are very efficient right? 3) What are some good books/sources for finding out more about the art of enclosure making? I want to know more about how to make enclosures. I know all the basics of making sealed and ported but I'm sure there is more out there that I can learn to take into account when making a box. 4) This is about boxes but about Bassbox Pro. Can you make the port fit in the enclosure when it does the diagram? My port lengths are fairly long so they won't fit in the box. Is there any way to get it to calculate the turn in the enclosure? 5) I heard there is something in bassbox that where you can use something that takes into account the vehicle it is in. What do you need to do this and how do you do it? Any help on any of these questions will be greatly appreciated. Thanks!!!

i was reading more about tl enclosures and it seems like everyone was saying there is not much of a science to them. you pretty much have to do a bunch of trial and error and hope to get lucky. is this true or is there a definate method on a tl design? i'm just curious about this tl enclosure because i haven't really heard much about them. are they really worth trying to make if you are looking to SQ?

indeed DYohn...there is quite a bit of science to to transmission line enclosures....definitely not for the novice