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Old 10th July 2012, 09:27 AM   #1
diyAudio Member
 
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Location: York UK
Default What is this showing exactly?

There's a lot of technical info on here which seems spurious, can someone enlighten me further with any of the articles please

Cardas Audio shows a "matched propagation conductor"

Thanks.

Last edited by nathanjh13; 10th July 2012 at 09:35 AM.
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Old 10th July 2012, 09:51 AM   #2
DF96 is offline DF96  England
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Join Date: May 2007
If it means anything at all, it is a claim that the propagation speed of a cable should be equal to the propagation speed of light within the dielectric. At RF frequencies this is automatically true: both vary as the square root of the dielectric permittivity.

For audio it is not so simple (because of conductor resistance), and not so necessary unless you are cabling a stadium. Audio cables are dispersive, but too short for that to matter.

I would ignore it. If he meant us to actually understand (and criticise?) what he means then he would describe his idea with more clarity. I assume Mr. Cardas is hoping to sell us something?
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Old 10th July 2012, 09:53 AM   #3
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Indeed, I thought so too. Thanks.

Hopefully it's nothing that using his wooden cable raising blocks can't solve.
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Old 10th July 2012, 10:14 AM   #4
DF96 is offline DF96  England
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Wood is a poor dielectric, variable in permittivity and loss. However, adding a lossy dielectric could actually reduce dispersion at audio frequencies because it would to some extent compensate for the conductor resistance. I am not encouraging the use of wooden blocks! If the effect is useful and signficant (which I doubt) then laying cables straight onto a wooden floor would probably be better and certainly cheaper.
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Old 10th July 2012, 10:26 AM   #5
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That ringing looks like the signal bouncing up and down the cable because it is not terminated correctly. I could be wrong!
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Old 10th July 2012, 10:45 AM   #6
DF96 is offline DF96  England
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I wondered that, but I would not want to accuse Mr. Cardas of misleading his potential customers!

Part of the salesman's art is to provide just enough information to produce desire for the product (due to the supposed problem it solves) in the minds of those who don't fully understand the technology, while at the same time giving insufficient information for those who do understand to be able to dispute it.
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Old 10th July 2012, 11:37 AM   #7
Enzo is offline Enzo  United States
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Wow, DF96, I applaud your very concise summation of said art. Very good.
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Old 10th July 2012, 12:04 PM   #8
wwenze is offline wwenze  Singapore
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There needs to be a gallery for words of such wisdom.
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Old 10th July 2012, 02:00 PM   #9
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^ Look up: "Roger Mellie's profanisaurus"...
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