In article , Eeyore
wrote:


Jim Lesurf wrote:

Hi,

I've just put up a new webpage that provides some measurements on the
properties of a variety of loudspeaker cables. The page is at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi Fi News' a
few months ago.

What IDIOT thinks the reactance at 30 MEGAHERTZ has any influence on the
listening experience.

Perhaps those who have observed more than one audio power amp oscillating
at RF as a result of the loading presented to it, and the amp not being
unconditionally stable. (Yes, including commercial designs.) Plus perhaps
having observed changes in the audio-band distortion behaviour as a result
of loading above the audible range.

And since when ( Fig 1 for example ) do you run a cable open or shorted
as a valid test ?

Surprised you don't understand that as I understand you are an engineer,
although I guess you may be unfamiliar with the methods that RF and
microwave engineering might employ for such things.

The measurements into an open and a short allow you to determine the
cable's complex impedance and propagation properties as a function of
frequency. They also give you some indication of the size of any impedance
swings the amp will experience into unpredicted loads. In essence at each
frequency the two complex values for the presented impedance allow you to
work out the required values for the cable.

WHAT A COMPLETE HEAP OF MINDLESS JUNK !

You should be ashamed of yourself and run some REAL models.

Alternatively, you could be embarassed by attacking in a way that shows
that your objections are based on not pausing first to understand the
reasons for the measurements. :-)

Slainte,

Jim

--
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