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Forgive my apparent ignorance on the subject but ...how can a straight wire cause/effect THD?
It doesn't. Kastor has a few things to learn about gauge variability, error bars, and R&R. Google fishing is hazardous unless you already have a pretty good BS filter.
Forgive my apparent ignorance on the subject but ...how can a straight wire cause/effect THD?
I'd assume with a relatively pure amplifier and pure transducer, if you connect them with a few metres of Lead wire, Lead as in the metal, to use a non-efficient example, that should affect transient response and THD to some extent.
A pure 1 kHz or 5 kHz or 7 kHz sine will not pass through non-interacted, since there is some interaction in the pathway.
If you increase the thickness of the Lead, it will become more efficient, but there is still interaction.
"I'd assume .."
It is really better not to assume in engineering. It is no different from guessing.
Hence your following paragraphs are pure nonsense, I'm afraid.
It is really better not to assume in engineering. It is no different from guessing.
Hence your following paragraphs are pure nonsense, I'm afraid.
If the cable can't be described in physical terms - it is probably soaked in snake oil.
Regards
Regards
So very true .🙂Google fishing is hazardous unless you already have a pretty good BS filter.
In my early days in electronics I though copper wire was just copper wire.
For one project we needed looked at different cables for a surveillance system as the wire runs from cameras could be quite long.
We bought in a few different cables and measured the resistance of them.
I was greatly surprised at the differences between copper cables.
Some were very resistive while others were low resistance.
I guess you can use cheap cable but preferably only in short lengths.
.................
Do you mean that different cables with the same diameter (etc) have significant different resistances?
Surely not? so what do you mean?
I'll bet that the more resistive ones had steel inner conductors.
They were all copper cables but I guess the quality of copper wasn't the same in each.
We bought a few reels from RS components.
That is not good enough for an engineer, Nigel 😀
What on earth do you mean by the "quality" of the copper??
It all started with Nigel's comment that he had to measure actual cables to find that there were significant differences.But this thread is about audio interconnects, where anything from the conductivity of copper to the conductivity of mud is acceptable. By all means use high quality copper in your transformers, but it really doesn't matter for interconnects - provided you can get a good soldered joint to it.
Then all hell breaks loose with various folk alleging that copper can't have different resistances.
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Then all hell breaks loose with various folk alleging that copper can't have different resistances.
No-one said that.
"I'd assume .."
It is really better not to assume in engineering. It is no different from guessing.
Hence your following paragraphs are pure nonsense, I'm afraid.
I'm not assuming, look at the Rin Choi and Nelson Pass papers and you will see clear differences in THD and transient response.
If you can't link me to THD in a Lead cable then your thought parameters are equally rich in assumption, thus equally nonsense if we follow your statement.
It all started with Nigel's comment that he had to measure actual cables to find that there were significant differences.
Then all hell breaks loose with various folk alleging that copper can't have different resistances.
Of course it can 🙂
But if your application does better with one or the other production method is a totally different question.
Regards
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If the cable can't be described in physical terms - it is probably soaked in snake oil.
Regards
This is true, but 7N Copper and Silver can be described in physical terms, Chrome and Lead as well.
I'd say HDMI cables can't, perhaps a Ferrite clamp or a thicker plastic is the usual case.
As I wrote, many transducer cables have unadvertised resistance or capacitance, they become passive equalizers with significant sonic differences.
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It all started with Nigel's comment that he had to measure actual cables to find that there were significant differences.
Then all hell breaks loose with various folk alleging that copper can't have different resistances.
....but isn't the only application where minor resistance differences in an RCA cable is of any real importance is between a turntable and a Phono pre?
....but isn't the only application where minor resistance differences in an RCA cable is of any real importance is between a turntable and a Phono pre?
6 metres of wire on the way directly into your ear or speaker is the most important if we look at the entire system.
This thread title says interconnects so I think I'll leave now.
No. Copper can't have very different resistances; it can have somewhat different resistances, but even this is irrelevant for interconnects.
That's interesting. I would assume exactly the opposite - no change whatsoever in transient response and THD. But what do I know? I just use circuit theory, based on the low frequency lumped approximation to Maxwell's equations. What do you use?Kastor L said:I'd assume with a relatively pure amplifier and pure transducer, if you connect them with a few metres of Lead wire, Lead as in the metal, to use a non-efficient example, that should affect transient response and THD to some extent.
Look at the harmonic distortion measurements here of Non-OFC Copper, OFC Copper and 7N Copper.
M.R.O.: The effect of headphone cables: SONY MDR-EX1000
http://3.bp.blogspot.com/-JwDW4jTCXic/T4q3rjJIs2I/AAAAAAAAAdc/97bmRIQjbNY/s1600/Left_thd.png
The load has non-linearity. That is why the cables change the graphs.
The graphs are only showing the importance of lower resistance cables. The metals of the wires are not producing any distortion.Yes and now I'm showing clarity with hard measurements so these "tosser" remarks will dissipate.
Yes, it will do so for non linear loads.He measured the impedance, the thicker 7N cable was around 1 ohm less.
Are you saying this will affect the THD?
Same wire resistance will produce the same results, independent of the wire composition.
jn
The load has non-linearity. That is why the cables change the graphs.
Could be, but you're assuming that the error bars are smaller than the reported results.
Could be, but you're assuming that the error bars are smaller than the reported results.
I assume testing to .2% THD is trivial.
100 to 140 db down, not so.
jn
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