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Exponential transmission lines



 
 
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  #1 (permalink)  
Old September 16th 03, 05:29 PM posted to uk.rec.audio
The Old Fogey
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Posts: 18
Default Exponential transmission lines

Anyone come across an exponentially tapered
transmission line, apart from the B&W Nautilus?
It looks like it would be an amusing project.
An infinite length exponential taper has a finite
internal volume so all I need is to find a wall material
with zero thickness :-)

Roger.
  #2 (permalink)  
Old September 17th 03, 04:47 AM posted to uk.rec.audio
malcolm
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Posts: 13
Default Exponential transmission lines


"The Old Fogey" wrote in message
om...
Anyone come across an exponentially tapered
transmission line, apart from the B&W Nautilus?
It looks like it would be an amusing project.
An infinite length exponential taper has a finite
internal volume so all I need is to find a wall material
with zero thickness :-)

Roger.


try here http://www.t-linespeakers.org/projects/index.html


  #3 (permalink)  
Old September 17th 03, 04:47 AM posted to uk.rec.audio
malcolm
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Posts: 13
Default Exponential transmission lines


"The Old Fogey" wrote in message
om...
Anyone come across an exponentially tapered
transmission line, apart from the B&W Nautilus?
It looks like it would be an amusing project.
An infinite length exponential taper has a finite
internal volume so all I need is to find a wall material
with zero thickness :-)

Roger.


try here http://www.t-linespeakers.org/projects/index.html


  #4 (permalink)  
Old September 17th 03, 03:05 PM posted to uk.rec.audio
The Old Fogey
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Posts: 18
Default Exponential transmission lines

"malcolm" wrote in message news:PPQ9b.480052$Ho3.81431@sccrnsc03...


try here http://www.t-linespeakers.org/projects/index.html


No good. They are almost all quarter-wave lagged organ-pipes and the
tapered ones are so short that they are really closed-boxes or
bass-reflex.

This is more the thing:

http://www.bwspeakers.com/index.cfm/...del%20Nautilus

Though a TL for a tweeter is rather pointless, it looks good.

Roger.
  #5 (permalink)  
Old September 17th 03, 03:05 PM posted to uk.rec.audio
The Old Fogey
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Posts: 18
Default Exponential transmission lines

"malcolm" wrote in message news:PPQ9b.480052$Ho3.81431@sccrnsc03...


try here http://www.t-linespeakers.org/projects/index.html


No good. They are almost all quarter-wave lagged organ-pipes and the
tapered ones are so short that they are really closed-boxes or
bass-reflex.

This is more the thing:

http://www.bwspeakers.com/index.cfm/...del%20Nautilus

Though a TL for a tweeter is rather pointless, it looks good.

Roger.
  #6 (permalink)  
Old September 19th 03, 06:43 AM posted to uk.rec.audio
malcolm
external usenet poster
 
Posts: 13
Default Exponential transmission lines


"The Old Fogey" wrote in message
...
"malcolm" wrote in message

news:PPQ9b.480052$Ho3.81431@sccrnsc03...


try here http://www.t-linespeakers.org/projects/index.html


No good. They are almost all quarter-wave lagged organ-pipes and the
tapered ones are so short that they are really closed-boxes or
bass-reflex.

This is more the thing:


http://www.bwspeakers.com/index.cfm/.../label/Model%2
0Nautilus

Though a TL for a tweeter is rather pointless, it looks good.

Roger.


yes , but what price?
they look like they are made of plastic!!


  #7 (permalink)  
Old September 19th 03, 06:43 AM posted to uk.rec.audio
malcolm
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Posts: 13
Default Exponential transmission lines


"The Old Fogey" wrote in message
...
"malcolm" wrote in message

news:PPQ9b.480052$Ho3.81431@sccrnsc03...


try here http://www.t-linespeakers.org/projects/index.html


No good. They are almost all quarter-wave lagged organ-pipes and the
tapered ones are so short that they are really closed-boxes or
bass-reflex.

This is more the thing:


http://www.bwspeakers.com/index.cfm/.../label/Model%2
0Nautilus

Though a TL for a tweeter is rather pointless, it looks good.

Roger.


yes , but what price?
they look like they are made of plastic!!


  #8 (permalink)  
Old September 19th 03, 09:12 AM posted to uk.rec.audio
Jim Lesurf
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Posts: 3,051
Default Exponential transmission lines

In article , The Old
Fogey wrote:
Anyone come across an exponentially tapered transmission line, apart
from the B&W Nautilus? It looks like it would be an amusing project. An
infinite length exponential taper has a finite internal volume so all I
need is to find a wall material with zero thickness :-)


It has just occurred to me that another problem in use would be the
propagation delay along an infinitely long transmission line might mean
you'd have to wait some time after starting to play the music before you
heard anything! Might be best to press 'play' then go and have your
dinner... :-)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html
  #9 (permalink)  
Old September 19th 03, 09:12 AM posted to uk.rec.audio
Jim Lesurf
external usenet poster
 
Posts: 3,051
Default Exponential transmission lines

In article , The Old
Fogey wrote:
Anyone come across an exponentially tapered transmission line, apart
from the B&W Nautilus? It looks like it would be an amusing project. An
infinite length exponential taper has a finite internal volume so all I
need is to find a wall material with zero thickness :-)


It has just occurred to me that another problem in use would be the
propagation delay along an infinitely long transmission line might mean
you'd have to wait some time after starting to play the music before you
heard anything! Might be best to press 'play' then go and have your
dinner... :-)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html
  #10 (permalink)  
Old September 19th 03, 05:51 PM posted to uk.rec.audio
Stewart Pinkerton
external usenet poster
 
Posts: 3,367
Default Exponential transmission lines

On Fri, 19 Sep 2003 09:12:46 +0100, Jim Lesurf
wrote:

In article , The Old
Fogey wrote:
Anyone come across an exponentially tapered transmission line, apart
from the B&W Nautilus? It looks like it would be an amusing project. An
infinite length exponential taper has a finite internal volume so all I
need is to find a wall material with zero thickness :-)


It has just occurred to me that another problem in use would be the
propagation delay along an infinitely long transmission line might mean
you'd have to wait some time after starting to play the music before you
heard anything! Might be best to press 'play' then go and have your
dinner... :-)


Um, the line absorbs the back radiation.......
--

Stewart Pinkerton | Music is Art - Audio is Engineering
 




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