Exponential transmission lines
 

"Jim Lesurf" wrote in message
...
In article , Stewart Pinkerton
wrote:
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.......

Blast! That ruins the joke. :-/ I was assuming that the actual speaker
unit was located a fraction of the length of the line away from the open
end - i.e. some way downline given that infinity/something = infinity.
:-)

Slainte,

Jim

how about a hybrid Horn TL speaker !?
anybody ever made these ? might be fun.

Exponential transmission lines
 

On Wed, 24 Sep 2003 22:06:36 GMT, "malcolm"
wrote:

how about a hybrid Horn TL speaker !?
anybody ever made these ? might be fun.

And about as sensible as a chocolate teapot.......

An acoustic transmission line (and a *real* one is very rare indeed)
presents a low and constant resistive load to the back of the drive
unit, whereas a horn is an acoustic transformer, and presents a very
high (and varying) load to the front of the drive unit.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

Exponential transmission lines
 

On Wed, 24 Sep 2003 22:06:36 GMT, "malcolm"
wrote:

how about a hybrid Horn TL speaker !?
anybody ever made these ? might be fun.

And about as sensible as a chocolate teapot.......

An acoustic transmission line (and a *real* one is very rare indeed)
presents a low and constant resistive load to the back of the drive
unit, whereas a horn is an acoustic transformer, and presents a very
high (and varying) load to the front of the drive unit.
--

Stewart Pinkerton | Music is Art - Audio is Engineering