Sub Box w/ pics

Iam curious where to get "Sonotube" at. Ive been experimenting with T-Line sub enclosures, and its hard to find any tubing other than cardboard, which works when your resin it, and layer it.  If anyone has tried T-Line, get back at me. I have a formula I should be trying this weekend. Just want some feedback.

I have cleaned up the wiring, just haven't taken new pictures.  Sonotube is cardboard tubing, and it is surprisingly  strong.There are 3 kinds of people in the world, those who can count and those who can't

okay let me get this, its like a bazooka tube but not, is the bass punchy like most "tube" boxes and how do you calculate how long the port is? is it better for the port to run the entire length of the tube? is this a transmission-line enclosure?  please answer all questions if possibleNick Scott

T-Line boxes are just a more dificult box to design, but I have experimented alot with about 7 box styles in the last month. And when you can get a 5.25" Vifa midrange to play the same bass extension as a 15" subwoofer, just a little quieter with almost no distortion, I feel its the best box design, best Ive ever done. The 8" box I had in another thread, I have showed, and let many people listen to it, and I put Kicker 10L5s, Jlw3s to shame with a simple paper cone, 4ohm 1.5" VC, 28oz mag woofer in that T-Line. You just have to understand a speakers  Tiel Small parameters to be able to build a T-Line enclosure, and since Iam in the speaker engineering field, its a pretty easy concept to grab, and to design a T-Line with only 2- parameters, that will kill speaker manufacturers box recomendations.