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In Reply to: RE: Wireless Router Contamination of Sound? posted by jfz on June 21, 2012 at 05:40:03
My wife and I have six macs between us. I hate to think of the mess using ethernet wires to connect them to the outside world or even using an Ipad.
Years ago I got my first charged cables. When I heard the big improvement when the final one was added, I knew that they were a must in the modern world. Of course I am just guessing that charged cables would not have improved sound in the 1950s.
I am now in the mountains of north central New Mexico. I can see one neighbor's house but no one is there. My computer shows one very weak wireless signal, I can get only satellite tv, but I can get 3G here as of this year. I bring my charged cables with me.
I guess a big faraday cage encompassing your house would help and perhaps eliminate the need for charged cabling, if you do not to contribute to RFI and EMI into your house.
Follow Ups:
"I guess a big faraday cage encompassing your house would help and perhaps eliminate the need for charged cabling, if you do not to contribute to RFI and EMI into your house."
Norm, if the charged cables are like the ones I'm thinking of, the AQ things with a battery pack, the charged aspect will have no bearing on their shielding effectiveness. The charging business is a scheme (a clever one in my book) to reduce problems due to dielectric absorption in the cable's insulation by essentially overpowering the audio signal to the point that it's varying electric filed is unlikely to make a lasting impression on the insulation. And that's a good thing, a very good thing as dielectric absorption can produce distortion that is annoying even in tiny amounts, probably because it's rather "unnatural".
Regards, Rick
The descriptions that I've seen about dielectric absorption give a linear model (R's and C's), which would not account for any of distortion, just changes in frequency response. Where is non-linear distortion described and how large is it? How tiny are the annoying tiny amounts?
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Electromagnetic devices with magnetic cores have saturation and hysteresis distortions. Sometimes the best way to look at it is through B=(mu)*H curves.
Steve Bench showed us that capacitors have saturation and hysteresis distortions online, perhaps best seen as D=(epsilon)*E, a very analogous formula for electrostatics.
The dielectric can saturate, too, or break before doing so with an arc-over. They are nonlinear as if magnetic materials, but in many different ways. So plastics distort differently than permalloy, for example.
DA can be seen in the hysteresis of the cap curves.
Tony, I'm not sure I remember the details very clearly. I was having problems with it in a S/H and one of the older guys in the department, now deceased unfortunately, happened to be quite knowledgeable about it and trotted out the ladder model and explained the limitations of it. One of them of course is that it has to be infinity long because some of the domains simply will stick for a very long time and may not flip back until reverse voltage is applied. The dielectric itself isn't linear. There were more but I think they were largely the result of the model using ideal caps (naturally). Real caps change size when you charge them and so they speak and listen and are affected by temperature, vib, signal rise time, on and on. There are actually mechanical changes occurring in the dielectric when the dipoles flip which store energy and help give it it's higher K. Believing that it's merely capacitance is just a convenient assumption.
I think I ended up using a polypropylene for the long ones and polystyrene for the short ones. I really like polystyrene (and they also sound very good in my opinion) but have shortcomings, typically they are just wrapped so their ESR and L aren't the lowest and worse yet they melt easily when exposed to heat or most any chlorinated hydrocarbon.
In the next version I replace the whole long S/H with a DAC, so much less grief. Just like home audio...
It would be an interesting project to try and quantify the relationship of dielectric absorption and sound in a reasonable application. I rather confident that I've heard it, but I sure haven't measured it.
Regards, Rick
In both cases the intent was to reduce RFI and EMI. Both use ac power supplies.
Thanks for the info Norm. Never heard of Exemplar Audio before.
I read the intro linked below and it was, um, interesting.
I wonder what it does and how it works, but then ostensibly so does the manufacturer so I don't feel too bad! That being the case it's tough to tell if it would have any effect on EMI. Or anything else for that matter...
Regards, Rick
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Yes, I think so too Norm and I'm glad that they sound good in your system.
Regards, Rick
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