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Dr Bailey on Transmission Line Enclosure stuffing

 
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frank
Junior Contributor 10+


Joined: 24 Nov 2004
Posts: 13

PostPosted: Mon Jul 28, 2008 2:03 am    Post subject: Dr Bailey on Transmission Line Enclosure stuffing Reply with quote

I came across an article of original correspondence following up Dr Bailey's articles on enclosure design and stuffing of transmission line speakers:

http://diyaudioprojects.com/Technical/Papers/Non-resonant-Loudspeaker-Enclosure-Design-Letters-to-the-Editor.pdf

Its interesting to see the discussion unfolding. I don't have much technical understanding of it but I gather from the Tl site that Dr Bailey's theory about the stuffing's part in the benefits of a TL is thought to be wrong:

"Speed of sound in a stuffed line -- The TL resonates at one quarter of the wavelength of the frequency set as the tuning point. The wave length depends on the speed of sound. Damping of the pipe will slow down the speed of sound a little, and since the wave length depends on the speed of sound, a slight lowering of the tuning frequency will occur. However, this is not a dramatically reduction at all. A couple of Hz is what you will gain at the most. It is very difficult even to be able to measure if the tuning frequency has changed, as the impedance curve is damped and flat. Your local altitude and the temperature of the air has more of an impact on the tuning frequency than the stuffing."
from http://www.t-linespeakers.org/design/MJK-for-dummies/index.html
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