When people tell me "Shielded cables using a metal foil which shunt electromagnetic energy to the ground." I have a hissy fit and like Goering I reach for my Browning.
This is the passage I lifted it from:
"RF and interference signals can be reduced by adding screening or shielding the
complete cable. A cable shield may be composed of braided strands of a metal such
as copper or a non-braided spiral winding of copper tape, or a layer of conducting
polymer; a metal foil which is bonded to a plastic film. This is the type of shielding
used for Atlas EOS power cables and the shield acts as a Faraday cage so that any
electrical signals on the outside of the cage will not be present on the inside of the
cage. The shield works by shunting electromagnetic energy (the RF or interference
signal) to the ground. To do this effectively a shield needs to cover the conductors
completely, so that RF energy cannot readily pass through any holes in the shield; it
must have good conductivity so that energy can be easily conducted to the ground;
and naturally there must be a good connection to the ground at the end of the cable."
If you think it's b*ll*x, give John Carrick a ring and I'm sure will be happy to explain further.
It's a solution to a non-existent problem.
RFI is quite a common issue with some cables like interconnects or subwoofer cables because they carry pre-amplified low level signals. This means that any RFI effecting these cables will end up getting amplified together with the low level audio signal.
In speaker cables which carry post-amplified high level signals you need a huge amount of RFI before it becomes audiable so in these cases it's very rare that shielded cables are needed here.
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Many years ago Isaac Asimov (who was an eminent chemist as well as a science fiction writer) wrote a book about science and scientific fallacies. In it he explained that he often got plans from people who had invented perpetual motion machines but he never bothered to look at them in detail because he knew that they didn't work because such a thing would contradict a basic scientific law. Now I'm not a scientist, eminent or otherwise, but I do have a scientific education and know which things are possible and which things aren't.
The shielding of cables is not a black art.....how to carry it out, and the reason for doing so, is generally accepted (but not universally so, obviously).
Wikipedia doesn't sell cables, and here is their take: http://en.wikipedia.org/wiki/Shielded_cable
"Everything has been said before, but since nobody listens we have to keep going back and beginning all over again." André Gide
Somewhat reluctant to join these cable debates but having a few moments to let my lunch go down ....
Shielded cable (obviously) has its uses and IMO may be of benefit in some situations. However, very expensive shielded cables?? A 'standard' shielded cable should be little more expensivemaybe.
Meanwhile. Back in my shed ....
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This was the only point I was trying to make....in the face of outright rejection.
There is absolutely no reason for shielded cables to be expensive. They usually cost a couple of quid per meter extra because they have a layer of metal foil and an extra layer of insulation.
But these audiophile 'bling' cables which cost hundreds of pounds are just a pure rip off. There's no need for them to be so expensive.
I'd pay for this though
What classical music are you listening to?
always worth going back to the head fi forums incident when somebody had their audiophile power cable destroyed by their cat and basically found out that his couple of hundred bucks worth of cable was in fact about 15 dollars worth of cable... http://www.head-fi.org/t/293165/my-cat-tore-up-my-virtual-dynamics-power-3
Yup, it was Lexicon.
Just a week prior to this article, a review of the player said this:
"I went out and bought an Oppo BD-83 SE in order to fairly compare the two. First off, there is no comparison between the build quality of the two players. The Oppo is lighter and the buttons have a far less solid feel to them. The Lexicon is a taller, much heftier unit. Black levels were close, but the Lexicon had a more natural contrast and color palette than the Oppo."
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Review here, LOL. http://www.head-fi.org/t/286475/virtual-dynamics-power-3-an-initial-honest-review
Thats not quite right. Oppo make them in China and Lexicon assemble them in the USA and charge considerable more. Note the Cambridge Audio version is almost the same also.
I'm beginning to think you are being deliberately obtuse! Nobody said that shielded cables were a black art. Any cable in the signal path should be shielded because whatever is there will be amplified. The most important thing for the shielding to keep out though is relatively low frequency noise and by far the biggest danger there is mains, ie 50Hz, hum because that's really audible and there is lot of it in any modern environment. Shielding a mains cable when the biggest source of potential noise is already inside it is simply pointless. And no shielding will remove noise already in the cable.
And as you want to quote science answer me this - the power supply in your kit will have large capacitors which are used to remove anything other than DC after the rectification process. They are large because 50Hz is a low frequency and the impedance of capacitors is inversely proportional to the frequence of the signal. So unless your equipment hums they are effective at 50Hz and at RF, which starts at around 3kHz, they will be at least 60 times more effective. At FM frequencies, around 90MHz, they are nearly 2 million times more effective! So how does this stuff which your cables purport to remove actually get into the signal path whilst the stuff which is much harder to remove doesn't? You are going to need a lot of woofle dust to explain that methinks.
According to Audioholics article:
"When we received the player the first thing we did was open it up to get a look at the inside. Imagine my surprise when I found that not only did the Lexicon share the same boards and transport as the Oppo - it was in fact AN OPPO BDP-83 PLAYER, CHASSIS AND ALL, SHOVED INSIDE AN ALUMINUM LEXICON WRAPPER. As far as we could determine, Lexicon didn't change a single thing in terms of the hardware. Heck, they didn't even lift the boards out of the chassis, opting instead to cut out the bottom of their own chassis to accommodate the venting locations, and putting a darker blue filter over the Oppo's VFD display to give it a slightly deeper hue."
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