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Old 3rd September 2008, 04:58 PM   #1
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Default TransmissionLine speaker Sd question ?

Hello !

when I build transmission line speaker I have choice of tapper range in 1 - 2.5 times SD

What's the difference in the sound ???

thanks in advance !

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Old 3rd September 2008, 06:55 PM   #2
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Actually, the Sd has nothing to do with the size of your transmission line, it is the Vas that matters*.

*(except in the very vague general sense that Vas tends to be larger for larger drivers)

You best chances of doing a good TL ar eto get Martin King's QuarterWave modeling SW...

community sites,, ........ commercial site planet10-HiFi
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Old 3rd September 2008, 08:47 PM   #3
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...and roughly size it using Martin's alignment tables. Or Augspurger's, if you can find them, and which complement Martin's in some areas. You can then run your TL through his worksheets if you wished to model it. As Dave says, the Sd of the driver basically has no actual relation to the necessary cabinet volume or taper requirements.

Alignment tables:

General TL information:
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Old 3rd September 2008, 10:12 PM   #4
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The choice of taper ratio has the most effect, it effects the length of the pipe, an SL/So of 0.1 will be shorter than SL/So =1 for example.
As SL/So becomes smaller the TL becomes more like an MLTL or a reflex box - this is probably where the most effect on sound will be? (I haven't built or compared MLTLs)
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 3rd September 2008, 11:43 PM   #5
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Right, providing Vp is sufficient. A tapered TL could indeed be regarded as a mass-loaded line, and will be significantly shorter for a given tuning frequency, although Vp is pretty much a constant.
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