Who makes a "true" Transmission Line speaker?...

If you have a chance, listen to Meadowlark Blue Heron II's. I have enjoyed mine for over a year--musical, plenty of bass, and easily driven. And Pat McGinty is great at answering questions in a timely manner: very knowledgable and friendly. Oh yes, and the cabinet-making is superb!
Joe

Trelja, I heard the Amygdala model at the 2002 CES. I enjoyed their sound. I hate using the term "musical", so let's just say that I hung around the Buggtussel room for a few songs, longer than in most other rooms!

The company people seemed to be quite informed as well as easy to talk with.

I was very impressed with the Fried TL's at the 2004 CES. Both fast and warm. Good qualities! Wanted to take them home.

There are many different types of designs that fall under the category of "transmission line". Some offer a consistent size "tunnel" from start to finish, some are tapered, some are flared, front or rear loaded, etc... Each has their own benefits / drawbacks. I think that "Audio" magazine had a pretty decent article about the variations that one could encounter on these designs, but that was probably at least 25 years ago or so.

While i don't know if they are still around, Kinetic Audio used to use a TATL ( Tapered Acoustic Transmission Line ) design. Some brands, like Von Schweikert and DCM, who claim to have TL designs, are not anywhere near what one would consider to be a "true" TL.

Audio Xpress ran an article on a "DIY" speaker project that utilized TL back-loading of the woofer. Several graphs and charts demonstrating how hard it was to properly fine-tune and the amount of reflections / standing waves / non-linear output that one encounters using this approach. One of the hardest to build & design correctly, hence the lack of information and commecial offerings.

Old Colony Sound Labs just released a computer program that allows for various TL designs to be simulated, so those that are truly interested in DIY'ing a set of TL's might want to check into this. Sean
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Kehut, I think they were the X-929. They were a tall, slim, high gloss black and maple (REALLLLLLLLLLY beautiful) speaker, using a D'Appolito arrangement. Not the deepest, punchiest, most resolving, or fastest speaker I have ever heard, but extremely easy to listen to. I would say that as my first encounter with the company, I was more than impressed. In my opinion, they were much superior to the Von Schweikert VR4Jr speakers that were next to them. Most in our group also strongly agreed.

Peter_s, if you liked the Frieds at CES2004, you will really love the current speakers. They are at least two steps up on the scale. The new ones are better in each and every way - more attractive proportions and incredible veneer, much better drivers (Vifa - low Qts, instead of Peerless), correct line damping, better crossovers (with correct values). Let's just say that what you heard was an early prototype, the current product getting released as we speak is just a speaker that one can take to market. How this translates sonically is night and day better imaging (you will be amazed that a big three way can do this), a lot more speed, clarity, resolution, deeper bass, more easy to listen to (the others were harsh), and the superior attack and decay of the notes from the low Q drivers and good line damping is something of note.