technical transmission line questions - Page 2

qi · 18th June 2005, 08:20 PM

Quote:

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)

vinylkid58 · 19th June 2005, 07:10 AM

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?

Jeff

MJK · 19th June 2005, 11:32 AM

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.

vinylkid58 · 20th June 2005, 06:30 AM

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.

Jeff

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19th June 2005, 07:10 AM	#12
vinylkid58 diyAudio Member Join Date: May 2005 Location: Victoria, B.C.	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? Jeff

19th June 2005, 11:32 AM	#13
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	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.

20th June 2005, 06:30 AM	#14
vinylkid58 diyAudio Member Join Date: May 2005 Location: Victoria, B.C.	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. Jeff