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Re: Experimental Data


FWIW the Supra website under technocal questions discusses directionality and other wire properties. Their claims seem rational and are backed up with experiments but it would be interesting to hear what an accomplished scientist would say.

I'm not an accomplished scientist, but I did sleep at a Holiday Inn Express. :)

A couple of comments.

First, they article is based on the false assumption that the wire is drawn unidirectionally. It's not. It's drawn alternately in one direction and then the other, many many times.

In order to draw the wire unidirectionally, you'd have to respool the wire each time it went through the die. In other words, you'd have to run it from one spool, through the die to a second spool, and then respool that second spool onto a third spool and then run that through the die so that the wire always goes through the die in the same direction.

That's simply not how the wire industry does it. Except in Belden's case when Steve Lampen had some wire drawn unidirectionally for the directionality listening tests he conducted some years back.

Second, I'm familiar with the Ben Ducnan article they mention. In it, Duncan was looking for rectifying effects of multiple meteal to metal contacts.

What he did was string a number of connectors together at each end of a length of interconnect and then fed it an amplitude modulated signal. I don't remember offhand what the carrier frequency was (I think it was 1MHz), but the modulating signal was 1kHz.

He then did an FFT looking for the 1kHz signal to show up due to the non-linear rectification caused by the contacts.

He found it I believe at about -150dB.

Anyway, he also made the same measurement with the whole cable and adaptor assembly switched around and was able to show a very slight but consistent difference between the two.

However that difference could have been due smply to a difference in contact resistance between the two arrangements.

Duncan's rather sloppy in his work and seems to be more interested in proving preconcieved beliefs than getting at the truth.

In the Great Cable Shootout they did some time ago, he "discovered" a current-dependent phase shift in the cable measurements he was doing.

LeSerf at Scotts Guide pointed out and documented that this could have simply been due to the fact that Duncan didn't account for the change in load impedance he used to change the operating current for the cable.

se





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