I don't believe cables make a difference, any input?

[Steve Eddy]

Originally posted by mrfeedback
Is this straight randomness ?
IOW, due to mutual interactions of differing numbers of electrons in electron shells, is there not a likelyhood that the thermal noise spectrum is different according to the conducting element.

With respect to the signal, yes.

This drift is still nowhere as fast as the propagation velocity (near to the speed of light) of the conductor is it ?.

No, but it's considerably faster than you can walk.

Is the text in your first post (...which decorrelates the quantization error from the signal so instead of signal-correlated quantization distortion, you're left with just a bit of quantum level noise....) copyrighted ?.

I don't claim any copyright to it, no.

se

[Steve Eddy]

Originally posted by mrfeedback
What are the fields extending outside the braid of a shielded, balanced line cable ?. - I have reasons to ask this question.

Fields extending outside the braid of a shielded, balanced line cable would be fields, yes?

Sorry, no idea what you mean by what are they other than fields.

se

[ThomasLMcLean]

CHRISTER:

I have down loaded the Elloitt article. Haven't read it all, but agree that fast amps and rf are bad news. The Elliot filter is one way to relieve the problem. I prefer shielding the cable instead of bypassing it. Sometimes both are necessary.

Twisted Shield Pairs for all interconnects including the speakers.

RF sources for rfi testing are easy. The first choice would be a cheap CB radio with whip antenna. Start with it in the same house then progress to the same room. It you dare, parallel the antenna to the cable, but, a couple of meters away. If the system can stand being in the same room with the CB I would say it passes. Hair driers or soldering guns are also used. These are placed close to the cable and turned on and off. Look for the snap, crackle, and pops.

KUEI:

First; I apologize if I pissed you off earlier. That was not my intent. My point was that the same micro structure defects you address in copper wire have relatively huge effects in semi-conductor devices and in my judgment should be addressed first. I profess to be an engineer and not a scientist. I do economics and schedules.

Keep typing I enjoy your posts.

CIRELOTRON:

You get the prize for an actual photo of a direct coupled gain clone. I loved it.

As I remember these devices the music was transferred from the cylinder to the amp through a Mono crystalline piece of bamboo. (The one I remember listening to as a young boy used a bamboo needle to protect the disk.)

[fdegrove]

Hi,

Twisted Shield Pairs for all interconnects including the speakers.

And applying capacitance nulling on them makes them better still.

Cheers,

[ThomasLMcLean]

CHRISTEN:

I read the article you linked. Very interesting. I particuliary liked with the cabling part and the unpredictable mature of rfi. Elliott gives a much better discription then I did.

Also browsed through the site and down loaded some other articles. A lot of good material. Also, Elloit seems to be a critic Nelson Pass. This would not be serious audio without serious differences of opinion.

FRANK: (edited)

Good to see you are still around.

I have been to Mole a couple of times. I have also seen the little boy in the entrance to the square and have even been to one of the bird markets. One of the folk heroes from my other dark side is OH4UN, John (de Vorhees sp?). First class engineer and an excellent writer.

[ThomasLMcLean]

Sorry Frank; I know who you are. It's just that it has been a long afternoon. Please forgive me.

May be if I would read the fine print I would get some of the fine points of this form, like editing.

Maybe I can make some of the rest of this work.

I just love it when a good design comes together.

Back to the lab.

[mrfeedback]

Originally posted by Steve Eddy
Fields extending outside the braid of a shielded, balanced line cable would be fields, yes?
Sorry, no idea what you mean by what are they other than fields.
se

For example a balanced microphone cable consists of a twisted pair surrounded by a shielding braid.
In my understanding, the purpose of the shielding braid is to keep external noise sources out, and the braid carries little or no currents.
Whilst such a cable is for instance carrying microphone signal, do any of this audio signal magnetic or electric fields leak out of the cable assembly.
If the cable assembly passes close to a for example chair leg, is the audio signal modified because of the proximity of the cable to such a conductive metallic material ?.

Eric.

[Steve Eddy]

Originally posted by mrfeedback
For example a balanced microphone cable consists of a twisted pair surrounded by a shielding braid.

Ok.

In my understanding, the purpose of the shielding braid is to keep external noise sources out, and the braid carries little or no currents.

Yes. Though it also works to keep the cable from radiating noise.

Whilst such a cable is for instance carrying microphone signal, do any of this audio signal magnetic or electric fields leak out of the cable assembly.

Certainly. Particularly magnetic fields seeing as the typical shielding materials (copper braid or aluminum foil) aren't very effective at all with regard to shielding against magnetic fields. But then magnetic fields are kept pretty low to begin with due to the close proximity of the of the signal conductors.

If the cable assembly passes close to a for example chair leg, is the audio signal modified because of the proximity of the cable to such a conductive metallic material ?.

Ultimately, yes. Particularly if the metallic material is ferromagnetic.

How significant it would be is another matter. But all electric and magnetic fields are effected by the permittivity and permeability of the medium they're propagating through.

se

[mrfeedback]

Ok, given the above information, what would be the effect of putting a ferrite cylinder (ala pc monitor signal lead ferrite cylinder) around a microphone cable ?.

Eric.

[Steve Eddy]

Originally posted by mrfeedback
Ok, given the above information, what would be the effect of putting a ferrite cylinder (ala pc monitor signal lead ferrite cylinder) around a microphone cable ?.

It would tend to increase inductance and introduce a bit of hysteresis.

se