"Folded" Sonotube TL Sub Complete! - Page 4 - diyAudio
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Old 12th September 2005, 05:06 AM   #31
bwbass is offline bwbass  United States
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Quote:
Originally posted by Clarkcr
Surely there is turbulance that will create a resistance of some sort.
True, but remember that in a non-tapered TL, unlike the port of a bass reflex box, air velocity is relatively slow. If the cross sectional area through the "bend" is equal to or greater than that through the line, there's probably more turbulence to worry about around the back of the driver's basket, as air is being pushed through a smaller space there.

This thread contains some of my discussion with MJK re: corner reflectors and line geometry:
Calculating bends in a tapered TL

Here is MJK and Bob Brines talking about TL bends and corner reflectors:
A LOT of question about TLs
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Old 16th September 2005, 02:54 PM   #32
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I like the idea of a concentric folded TL. Im thinking of using PVC instead of sonotube. Weight isnt an issue for my application, and the rigidity of the tubes allows for a pair of ends to hold the inner tube centered, and then just a bunt-cake style reflector for one end.

Sound good, or just insane?
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Old 16th September 2005, 04:22 PM   #33
Clarkcr is offline Clarkcr  United States
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Sounds great but don't discount the sound deadening properties of the wood fibre sonotube. It is easier to cut, glue and comes in more sizes than PVC. I like the idea of slicing out strips in the sonotube to be able to make a custom diameter tube like the one fellow on this thread did.

Also, the bigger diameter sonotube is very strong. I don't think you would have any problem with weight.

C
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Old 16th September 2005, 05:14 PM   #34
MJK is offline MJK  United States
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Quote:
Surely there is turbulance that will create a resistance of some sort.
Turbulance? Remember that the air is oscillating back and forth a very small distance in the TL, as frequency increases I believe the range of motion is going to decrease. There is no "flow" of air. I don't believe that turbulance is an issue in a classical TL, even in the folds. In a vented system with a restricted port it does show up if the system is pushed hard, but in a TL where the cross-sectional area is at least equal to the driver cone area, I have a hard time being concerned about turbulance.
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Old 16th September 2005, 06:12 PM   #35
Tweeker is offline Tweeker  United States
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I looked at using pvc, the prices of the big bore stuff gets really really steep, didnt want to spend more on plastic than the rest of the system.

I was going to paint/tar the noodles so theyd be similar absorption wise as the rest of the enclosure.
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Old 17th September 2005, 06:34 PM   #36
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Speaker Builder 1/90 (now audioXpress)....

dave
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Old 18th September 2005, 07:56 PM   #37
bwbass is offline bwbass  United States
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Pretty cool, Dave, but that's not a TL, is it? Looks more like a sealed box with a fancy reflector at one end... or would that qualify as a bandpass design?
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Old 18th September 2005, 08:58 PM   #38
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Quote:
Originally posted by bwbass
Pretty cool, Dave, but that's not a TL, is it? Looks more like a sealed box with a fancy reflector at one end... or would that qualify as a bandpass design?
It is a TL. 15" bass driver fires down into the inner tube, folds at the bottom, and exits at the top of the outer tube.

dave
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Old 5th May 2009, 07:58 PM   #39
RussMP is offline RussMP  United States
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Default Sonotubes

If anyone in the NY Tri-State area is interested, we sell Sonotubes at a real good price. 6" to 16" Inside Diameter.
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