Transmission line cross-sectional area question

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h@kan

h@kan

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Joined 2008
I'm planning to build a Classic TL out of standard sewer pipes.

The sketch shows how I intend to construct it.
My question is if this is possible considering the physics of a TL, I mean the cross-sectional area of, especially, section 2 is quite funny. Will MJK's mathcad sheets give me a relevant simulation?

Something tells me that a cross-sectional area like this will be problematic but
thats just a feeling...

Regards H@kan
 

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h@kan

h@kan

Member
Joined 2008
The sketch is just for illustrating purpose. I think I will use a ~3" FR driver, perhaps Alpair 6, and tune the line to ~65-70 Hz so the total hight of the cabinet will end up around half a meter.

Yes I can model it with MJK's sheets but I was uncertain if the geometry of the cross-sectional area is restricted to certain conventional geometries.

Suppose that you have a A*B cross-sectional area. Wouldn't there be a break-point, when one of the sides become significant greater than the other, when the model no longer gives you a relevant output?

In my case (in section 2) the "A*B" ratio is ~1:12

Regards H@kan
 
h@kan

h@kan

Member
Joined 2008
chris661 said:
Brilliant idea.

It would be pretty neat to build it out of clear plastic, so everyone can see the "magic" that goes on inside.

Chris
Click to expand...

Yea that would have been nice but besides that you probably would just see damping material, as Dave pointed out, the main idea was to use standard sewer pipes and I have never seen any transparent ones. I can see why considering the conventional usage of sewer pipes :)

One can of course, if using clear plastic, use some "fancy" damping material :)

il_430xN.55013368.jpg


Regards H@kan
 
picowallspeaker

picowallspeaker

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Joined 2007
Those are big pipes , more than a half inch thick , used by public administration for water distribution , I guess . Using orange and gray ones ,which are thinner , brings the problem of bracing , which can be done with lead sheets , and the resulting weight would be then comparable if done with MDF .
 
h@kan

h@kan

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Joined 2008
planet10 said:
Organizing the tubes like this is easier to build small cylindersealed at the top. big one on the bottom. Not to scale.
dave
Click to expand...

Interesting! This would be far easier than my original concept.
I can see one problem thou, my kids will probably "fill her up" with lego bricks and other junk :)

picowallspeaker said:
Those are big pipes , more than a half inch thick , used by public administration for water distribution , I guess . Using orange and gray ones ,which are thinner , brings the problem of bracing , which can be done with lead sheets , and the resulting weight would be then comparable if done with MDF .
Click to expand...

The pipes I'm planning to use are, as you correctly assumes, thin pipes with a thickness of around 5 mm. I think at least the bigger surrounding tube will need some bracing.

This product is cheap, easy to mount and I think it will do the job http://translate.google.com/translate?prev=hp&hl=sv&js=y&u=http://www.biltema.se/products/product.asp%3FiSecId%3D1341%26iItemId%3D148054&sl=sv&tl=en&history_state0=
 
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