Thanks for the valuable information, sir bruno.
The transmission line ("T-Line") enclosure had been around long before Bose patented its Acoustic Waveguide, but many are under the mistaken impression that the T-Line was invented by Bose.
Ang galing talaga ng marketing ng Bose!
From
http://www.intellexual.net/bose.html:
BOSE AND THE PATENT SYSTEM:
To quote from Michael Wong, a visitor to this site: "...a casual perusal of their website reveals that they have used money and lawyers to repeatedly abuse the patent system. They have patents for the Acoutimass (Helmholtz resonator), the Direct/Reflecting technology (multipolar speakers), their Acoustic Waveguide (transmission line), and their JewelCube technology (amalgam of transmission line and other old ideas). In each and every case, their patent is a joke; an obvious example of the all-too-common trick of making one minor alteration upon a pre-existing idea and then using an army of lawyers to get it patented... And why all the bother? Because it looks good to write "patented technology" on the box...". For a company that emphasizes cutting-edge research so much, I'm curious as to why their flagship 901 speakers have not seen any signigicant mechanical changes in the last 15 years. Where is the "better sound through research" going?