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Old 17th January 2011, 03:42 AM   #8861
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Quote:
Originally Posted by 1audio View Post
JFor the Physicists reading:

I don't have a good enough understanding of electrostatics to say what happens when a conductor is between two conductors that have a potential. If the conductor is not connected to them I believe it will adopt a potential relative to them proportional to the capacitance. If its connected to one of the conductors then it won't have a potential to the conductor its connected to. In the second case would the lack of a potential between the conductors be affected by the electrostatic field from the conductor with a potential? If so, how and how much?

This is the situation with the Audioquest design as far as I can tell.
Well, the whole idea behind the DBS system is to bias the dielectric, not the conductors.

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Old 17th January 2011, 04:46 AM   #8862
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Default USB and other digital cables

While I can understand what might go wrong in a digital cable (noise especially) most don't seem to suffer irreparable harm.

For example. In a recent test I was able to make bit perfect recordings of complex music via USB and SPDIF. Signal flow thus: USB cable->Converter->Coax cable->Converter->USB cable. No fancy cables, except maybe the Canare coax.

If there were any errors along the way, something fixed them. So the end result was perfect, bit perfect.
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Old 17th January 2011, 03:18 PM   #8863
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Heavens to Van der Waal's forces. The one with the greatest resistance to deformation and therefore fluctuating capacitance resulting from geometric distortion in the face of Van der Waals forces wins. I guess that would be.....ceramic.
I meant the electrostatic force, it's attractive for either polarity. Imagine an unbiased electrostatic speaker.
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Old 17th January 2011, 03:30 PM   #8864
hhoyt is offline hhoyt  United States
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Default Dielectric bias

Quote:
Originally Posted by Steve Eddy View Post
Well, the whole idea behind the DBS system is to bias the dielectric, not the conductors.

se
And Steve, you already got to the kernel of the issue; is there a non-linearity at the "zero" crossing that this bias eliminates?

Quite frankly, this biasing is done every day with normal phantom powered condenser microphone channels. The preamp supplies a constant 48 volt bias between pin 1 and 2+3. SO........ will we now hear people attributing a difference or improvement in the sound of condenser microphones over dynamic mics due to this dielectric biasing? Maybe 48 volts isn't enough to bias the cable non-linearity? You see where this could lead.

If there is a non-linearity to the cable dielectric, then all test equipment cables would show the phenomenon in all measurements to one degree or another, so we would never be able to see past that distortion.

Really, the issue that needs to be settled (IMHO it has been debunked already) is the presence of any cable non-linearity at the zero crossing.

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Old 17th January 2011, 03:38 PM   #8865
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How about the horrible dielectric in high K ceramic capacitors, while the bulk voltage coefficient is easily measured I have seen no reference ever to "diode like" zero crossing distortion. Not for any capacitor for that matter.
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Old 17th January 2011, 04:03 PM   #8866
1audio is offline 1audio  United States
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With the possible exception of electrolytic caps? And what about voltage coefficient of capacitance? I don't know how measurable these are.
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Old 17th January 2011, 04:10 PM   #8867
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Quote:
Originally Posted by hhoyt View Post
Really, the issue that needs to be settled (IMHO it has been debunked already) is the presence of any cable non-linearity at the zero crossing.

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I vote for contact (arcing ?) phenomena, not cable non-linearity.
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Old 17th January 2011, 05:00 PM   #8868
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The presumed diode effect is easy to disprove. If it existed, then THD measurements at very low signal levels would be high and rise as signal level is decreased just the way it does for crossover notch distortion in class AB amplifiers that are not properly biased. I have never heard that such distortion has been reported for cables.
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Old 17th January 2011, 05:10 PM   #8869
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A.J. van den Hul believes it is there. Don't ask me for his analysis though.

A.J. van den Hul: Going Dutch Page 5 | Stereophile.com

search in page for 'crossover'
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Old 17th January 2011, 05:24 PM   #8870
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A.J. van den Hul believes it is there. Don't ask me for his analysis though.
He's talking about "diodes" in the wire itself rather than the dielectric. This is the reason he gives to justify his carbon fiber "sparkplug wires."

This seems to stem from the notion that there is copper oxide between the copper grains in the wire and as everybody knows, they make diodes using copper oxide.

But to make a copper oxide diode, you need to go from copper, to copper oxide, to something other than copper (often lead). So the notion is a bit misplaced.

But hey, it scares the bejeezuz out of people and makes for good marketing literature.

se
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