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In Reply to: RE: Ars Technica dissects an AudioQuest Vodka ethernet cable posted by Ugly on July 24, 2015 at 12:56:34
"Regarding your "open lines". You must be talking about speaker cables judging by your termination values."
No, they're interconnects actually.
I wanted to get away from the dielectric absorption AND multiple strand wires common in shielded cables.
The impedance is sort of a compromise driven roughly by the nominal port impedances and size issues. The in-band impedances of my solid state gear run vaguely 50K at the receivers and 100ohms at the source. Normal shielded cable is around 50-90 ohms so the whole mary-ann is, technically, a POS. But them's the givens.
I was hoping to be able to use TV twinlead but it didn't sound good for some reason. I suspect that longitudinal currents in the common line are intermoding with the signal current through it. Anyhow solid wire sounds much better so I'm using double runs of Beldon 8066. It's 28AWG magnet wire whose most outstanding property is that it's on an almost full roll in my junkbox.
The wire insulation is electrically "hard" which means that it has little interaction with the signals and the tape seems to also be benign.
As far as needing to terminate the wire goes, I think it's a Fn of the cable's dielectric ansorption losses. The less there are, the more it benefits from termination. But the more there are, the more distortion happens to the audio signal. I could easily be all wet but emperically that seems to be the case and DA causes time-energy smearing which we seem to be especially sensitive to. Probably a holdover from the jungle days of fast twig-snap analysis having survival value...
Regards, Rick
Follow Ups:
"The wire insulation is electrically "hard" which means that it has little interaction with the signals and the tape seems to also be benign."
As you'd hope a good magnet wire insulation would be. The other good thing about magnet wire insulation is it's super thin for tight packing. Even if the coating isn't perfect it's impact will be minimized since it's such a thin coat.
Well it's interesting for sure.It sounds like most of us must be enjoying the benefits/tragedies of our non linear terminations without even realizing it is there.
Can you share your construction technique? Do you just hold it all in place with the masking tape? What's your wire spacing? How close do you route these things which might couple electrically?
The hang up I'm having is loop area. Won't a twin lead esque arrangement have more diff mode noise issues? My turntable/high gain preamps tell me I have some extremely healthy 60HZ field in the neighborhood of my amps which is the exact neighborhood these dudes would live in.
Thanks for the discussion man. What I wouldn't give to buy you a beer sometime and pick your brain about WMD construction etc for a while...Cheers!
Edits: 07/24/15
Can you share your construction technique? CRUDE
Do you just hold it all in place with the masking tape? YES
What's your wire spacing? HOPEFULLY there is an attached picture of it.
How close do you route these things which might couple electrically? WELL, other than trying to not have them lay along power cords they're just part of the jumble.
The hang up I'm having is loop area. Won't a twin lead esque arrangement have more diff mode noise issues? My turntable/high gain preamps tell me I have some extremely healthy 60HZ field in the neighborhood of my amps which is the exact neighborhood these dudes would live in. I SUSPECT that it's not a good choice for the TT to Preamp cable but might work if the Zo of the cartridge is low enough.
These were just done for fun and out of curiousity. My objective initially was to try and understand the factors that matter in interconnects. And I suppose nowadays that it's no big surprise that about everything does to some extent. Sorting out the mechanisms is another matter but DA seemed to be an important factor so I tried to minimize the dielectric. The cool thing is I ended up with much improved sound for next to no money and had fun.
The uncool thing is that the adhesive on the tape drys our eventually so after a decade or so they sort of crumble... Always something.
Rick
Thanks for the pic. Cool interconnects!It is telling that they have stood the test of time in your system.
I don't see how I not try these at some point when I get some time and materials on hand.
I definitely appreciate the approach, trying to exaggerate a certain effect you suspect you find important to help understand how it fits in the big picture.
Have you played with the termination much? I'm wondering how the tradeoffs between audiophile and high frequency cap play into the equation? Some tiny surface mount networks soldered between pairs near the ends might survive with the tape to hold it. You could get that thing to up into the VHF.
Edits: 07/25/15
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