Commercial and Amateur Loudspeaker Designs
Commercially successful folded transmission lines have been produced, although some have suffered from reflections at the bends.
One example of a transmission line enclosure design was by Vivan Capel called the "Kapellmeister" published in Electronics Today International, circa 1975. This was a double-folded line which placed the first, third, and fifth harmonics of the line's resonant frequency at the bends and the exit, where they would cause least movement. The Kapellmeister suffered from poor deep bass, and was designed around a low power driver. Capel, like Bailey, believed that the pipe's cross-sectional area needed to be equal the driver's cone area.
There are not many companies producing commercial transmission line loudspeakers as the technology is difficult to get right. One company that does successfully manufacture them is UK based PMC or the Professional Monitor Company. Its hi-fi and studio monitor designs use a development of the transmission line that they call the Advanced Transmission Line.
Read more about this topic: Acoustic Transmission Line
Famous quotes containing the words commercial, amateur and/or designs:
“It is only by not paying one’s bills that one can hope to live in the memory of the commercial classes.”
—Oscar Wilde (1854–1900)
“The true gardener then brushes over the ground with slow and gentle hand, to liberate a space for breath round some favourite; but he is not thinking about destruction except incidentally. It is only the amateur like myself who becomes obsessed and rejoices with a sadistic pleasure in weeds that are big and bad enough to pull, and at last, almost forgetting the flowers altogether, turns into a Reformer.”
—Freya Stark (1893–1993)
“I have nothing against the Queen of England. Even in my heart I never resented her for not being Jackie Kennedy. She is, to my mind, a very gallant lady, victimized by whoever it is who designs the tops of her uniforms.”
—Leonard Cohen (b. 1934)