Those great RCA connectors are a big issue. With oxidized metal (copper, etc) used the issue comes from when the current passes from wire thru the connector contact point(s).--- I got it. But it does depend on the connection/connectors used with the cable and equipment connectors, too.
THx-RNMarsh
Corroded/oxidized connector contact.
Oxidized copper (and other metals) contact will create a diode junction - if the signal has to pass thu it, distortion can be produced.
With oxidized wire, only, the oxide layer will attenuate HF portion of the signal. This is what we normally have. Silver plated copper will do better (and some say it sounds brighter in comparison) - until the silver oxidizes.
There is a LOT of information in this area. There is whole book devoted to copper. A sample might be this - View attachment CopperOxide.pdf
The contacts and wire and pcb traces must be oxide free and not left to get worse and worse over time. Cleaning off the oxide might be done periodically, gold plating will help in some places (pcb) and on better RCA connectors --- tight (air tight contact) and hard gold plating is needed. That just leaves the wiring/cable itself.
You wouldnt measure distortion just going thru the wire with oxide layer.... but if you have to go thru the oxide layer to another (eg. connector contacts), better make it an oxide free connection.
THx-RNMarsh
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Well, why you haven’t said that from the start?
I can’t get any clue with this damn BNC to BNC cable.
I had that feeling that this will go nowhere while I was doing the (hundred plus) resistance measurements.
BNC connections give very repeatable results.
All those FFTs within each measurement set look the same to me.
I will do some more tests today (wav. recordings for further analysis).
Now, 1Vrms generator out, Instrumentation amplifier gain X1
George
Attachments
Metric system on the Moon? There you go
https://en.wikipedia.org/wiki/Lunokhod_programme
https://en.wikipedia.org/wiki/Lunokhod_2
18.72mVrms generator out, Instrumentation amplifier gain X1050
End of 'data' for today
George
George
Great work. I sent you a PM.
Thanks
ES.
Your way of thinking about this is a bit one sided. I have been doing work while in the US using imperial, and once you get the trick, it actually is quite a handy system to design and build stuff in. It all just multiples and fractions in stead of the straightforward approach of metric; it is log scale versus linear. In some ways imperial can be more intuitive.
Actually I use 11 gauge for woofers but only 14 gauge for tweeters. 10 gauge under some versions of electrical code must be in conduit and it also is too thick to fit it the industry standard Neutrik loudspeaker connector. I get away with 14 gauge because of skin effect and it costs half as much.
Now silver oxide is actually also a good conductor it is the silver sulfite that is not. There is a patent on using lower conductance coatings on wires to act as filters.
RNM I PM'd you!
And of course blanket statements are always wrong!
And of course blanket statements are always wrong!
Some say silver sounds bright and lead sounds dull. Yawn.
It exhibits some resistance to semantic analysis too.vacuphile said:
Plain new copper gives a slightly 'brassy' effect to the sound at first, but it soon sounds dull. Aluminium wires, of course, put an almost invisible sheen over the sound which protects it from further degradation. Potato interconnects, of course, give synergistic energy with spud amps.RNMarsh said:
Agreed that there are too many claims out there contrary to well established science. However, if somebody measures a directional effect, there is apparently directionality somewhere, perhaps in the measurement apparatus or test setup. Either that, or there is a statistical sampling effect, where perhaps the experimenter discards more random looking datasets, and attributes meaning to the less random looking ones.
There certainly is truth to that ask any metalsmith. As to the use in wires there are folks who perceive a difference between copper and silver. So you can choose to ignore the noise or see if there is a measurable difference that would account for such perceptions.
It could be that dwarves work the silver wire!
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