I am not familiar with the T+A speaker, but have owned the Acoustic Zen Crescendo which is a Transmission Line Design. Wonderful sounding speaker. Made in America. If you're interested in the speaker design or the T+A specifically?
T&A Criterion TB 160 - any around?
Came across first a photo, then a cross section and finally read a test Stereoplay. I have always been intrigued by transmissionline speakers, and this one uses dual 10" with front firing into 2 short transmission line channels (mid bass), and rear into vented (for low bass).
Would like to audition (or even buy if cheap), but haven't found any.
Even the T+A Criterion TB 140 might be of interest (the ebay listings for TB140 and TB120 sound a bit strange, and zero feedback sellers).
Also curious who has heard them and what impression they made.