"Folded" Sonotube TL Sub Complete! - Page 4

bwbass · 12th September 2005, 05:06 AM

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

Tehrasha · 16th September 2005, 02:54 PM

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?

Clarkcr · 16th September 2005, 04:22 PM

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

MJK · 16th September 2005, 05:14 PM

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.

Tweeker · 16th September 2005, 06:12 PM

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.

planet10 · 17th September 2005, 06:34 PM

Speaker Builder 1/90 (now audioXpress)....

dave

bwbass · 18th September 2005, 07:56 PM

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?

planet10 · 18th September 2005, 08:58 PM

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

RussMP · 5th May 2009, 07:58 PM

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

5th May 2009, 07:58 PM	#39
RussMP diyAudio Member Join Date: May 2009	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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16th September 2005, 02:54 PM	#32
Tehrasha diyAudio Member Join Date: Sep 2005	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?

16th September 2005, 04:22 PM	#33
Clarkcr diyAudio Member Join Date: Jun 2004 Location: Houston, TX	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

16th September 2005, 06:12 PM	#35
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	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.

18th September 2005, 07:56 PM	#37
bwbass diyAudio Member Join Date: Oct 2004	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?