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Old 18th June 2005, 08:20 PM   #11
qi is offline qi
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CORRECTION... should be 5" pvc pipe not 6"
Using the specs from the AURA 4" that you posted, and using Rick Shultz' AlphaTL spreadsheet...

Qts: .39
Vas: .133 ft^3 (3.78 L)
Fs: 57
Fb: 40 (~.7*Fs)

Line length would be 5.7 ft
Inner pipe diameter would be 4.5" (5" PVC pipe should be used)
Fibreglass stuffing -- 1/3 lb per ft^3

You could use 6" pvc pipe but the length would have to be 47" yielding an Fb of 57 (the driver's Fs)
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Old 19th June 2005, 07:10 AM   #12
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Are the advantages of a tapered line relative to a 2-way speaker
system less, where the LF driver would be crossing over as high
as 2500 Hz. Would a straight line be better overall?

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Old 19th June 2005, 11:32 AM   #13
MJK is offline MJK  United States
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I think that the advanyages of a tapered system listed above are still true for a two way crossed over to a tweeter. The 3/4 wavelength mode, and the other higher order wavelength modes, will be higher in frequency for a tapered TL where the stuffing is more effective at damping them out.
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Old 20th June 2005, 06:30 AM   #14
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Thanks Martin. I just assumed that a tapered line was superior.
My first pair of TL's are now 25 years old, so I'm a little out
of the loop so to speak. After seeing the info on your site, I
realize TL theory has changed dramatically.

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