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Hi Max,

Art and David have forgotten more about speaker building than I've learned yet, and the only reason I'm chiming in is because i have a pair of 3TX.  I'd happily share picts and dimensions of the box, but since it is a current commercial product, I don't feel that information belongs to me to give away.


What I do think is fair to say, is that the guys' information on how shelf ports work is reflected by measurements I've taken.

(I tried setting up a 3TX with active x-overs for a learning exercise..... http://forums.prosoundweb.com/index.php/topic,164582.0.html )


I can also say I'm not so sure when you call a design a ported box, or when you call it a transmission line.....I think it gets hazy based on the actual port geometry....