KSTR
Major Contributor
For about several years we see the topic pop up here and there in various forums, and today, besides the usual DIY approach, we even have some cable manufacturers that offer this additional screening method for various cables.
John Swenson Shield Ground (JSSG) looks like this:
A second shield sleeve is put on the existing cable and the shield ends are connected together with a separate isolated wire running alongside the shield. The idea and the claim is that the loop wire is "shorting out" any noise signal on the added shield, making it highly effective to reduce pickup of magnetic field (developing common-mode voltage differentials) by the inner cable, as well as likewise reduced emission.
Trained EE's will already have developed goosebumps of anger just by this....
To my knowledge, as of yet no measurements, at least at a semiprofessional level, that show this really does work (or how it is supposed to work) have been published. Also, of course no blind testing of the acoustic effect has ever been attempted (and most likely will never happen).
I took the time to do some relevant measurements as well doing some thinking how this might work (or, better said, why it doesn't) and wrote a little paper on that, see attachment.
As expected, the whole thing turned out as a complete hoax (and sure doesn't help Mr. Swenson's reputation, being "chief engineer" at UpTone Audio) whereas conventional physics and electric engineering have been shown to be correct, once again. That won't convince the believers ("if it does't show anything, you've measured the wrong thing, your approach and setup are not adequate to the task", etc, etc, blah, blah).
We'll get over it, and I hope my paper helps improve the understanding of those interested in this kind of topics, with a sane level of scepticism.
John Swenson Shield Ground (JSSG) looks like this:
A second shield sleeve is put on the existing cable and the shield ends are connected together with a separate isolated wire running alongside the shield. The idea and the claim is that the loop wire is "shorting out" any noise signal on the added shield, making it highly effective to reduce pickup of magnetic field (developing common-mode voltage differentials) by the inner cable, as well as likewise reduced emission.
Trained EE's will already have developed goosebumps of anger just by this....
To my knowledge, as of yet no measurements, at least at a semiprofessional level, that show this really does work (or how it is supposed to work) have been published. Also, of course no blind testing of the acoustic effect has ever been attempted (and most likely will never happen).
I took the time to do some relevant measurements as well doing some thinking how this might work (or, better said, why it doesn't) and wrote a little paper on that, see attachment.
As expected, the whole thing turned out as a complete hoax (and sure doesn't help Mr. Swenson's reputation, being "chief engineer" at UpTone Audio) whereas conventional physics and electric engineering have been shown to be correct, once again. That won't convince the believers ("if it does't show anything, you've measured the wrong thing, your approach and setup are not adequate to the task", etc, etc, blah, blah).
We'll get over it, and I hope my paper helps improve the understanding of those interested in this kind of topics, with a sane level of scepticism.
