On Tue, 02 Sep 2008 09:48:21 -0500, flipper wrote:

On Tue, 2 Sep 2008 21:57:00 +1000, "Phil Allison"
wrote:


"flipper the fool "


Then why didn't you answer his question "How could a toaster work if
its line cord has hundreds of ohms of impedance?"


** Cos it was a stupid & irrelevant bait.

No, what's "stupid" is you can't explain why zip cord works perfectly
fine for toasters (and speakers) even though your audiophool cable
folks claim it has well over 400 ohms 'characteristic impedance' at
50/60Hz.


The answer is because it isn't a transmission line...

** Shame that is a 100% wrong answer.

Shame you apparently don't know squat about transmission line theory.


At audio frequencies transmission line effects don't begin until you
reach one or two thousand feet and at 50/60Hz power line frequencies
it's on the order of 5 miles.


** Shame that is 100% wrong too.

http://www.audiosystemsgroup.com/TransLines-LowFreq.pdf


It's worse than the paper suggests. Characteristic impedance is the
apparent impedance at one end of an infinitely long hunk of
transmission line. For any but a lossless line, there's, well, loss.
And presumably what the The Compleat Audiophool cares about is what
gets to the speakers, not the load the amp sees.

Once the series and shunt resistance begin to have any significant
effect on characteristic impedance (ie, at low frequencies and for
very long lines) the signal that dribbles out of the far end is mostly
gone.

How many people use miles of speaker cable?

How many people can clearly hear attenuation effects that measure in
the parts-per-million? I bet I can name one.

John