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

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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Kevin: Having spoken to Brian on more than a few occassions, i don't think that it was his intention to spread rumours or attack Buggtussel's reputation in the least. Brian is a very polite and conscientious individual to say the least. I'm quite certain that he was only sharing his own personal experience with the speakers based on the interaction with his components in his room & system. As to his comments about Buggtussel being out of business, his assumptions would seem logical if one lived locally i.e. the production facility is no longer where it was and former employees are working elsewhere, etc... As such, while i'm glad that you are still with us, and i would venture to say that Brian is too, there's no need to get hostile. Your post more than cleared the air about any misconceptions.

As far as the TDL's go, Brian never mentioned them at all. As such, it was not he that drew any conclusions or made any comparisons between them. You might want to re-read his posts and those of a few others to address the individuals that made such comments. Sean
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