Mikekan wrote:
All of them claim that it is a way to minimize skin effect, that is the thin conductors.
Talking about audio, skin effect is a big myth... It simply does not exist in audio frequency range...
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... Skin effect is a tendency for alternating current ( AC ) to flow mostly near the outer surface of a solid electrical conductor, such as metal wire, at frequencies above the audio range. The effect becomes more and more apparent as the frequency increases.
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Skin depth values for some common good conductors at a frequency of 10 GHz (microwave region) are indicated below......
Conductor Skin depth (μm)
Aluminum 0.80
Copper 0.65
Gold 0.79
Silver 0.64
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Some so called "exotic" Cable Companies enjoy spreading the fallacy that Skin Effect can cause deleterious effects on your audio performance. While Skin Effect is a real world problem in high frequency applications such as RF Power and Transmission, it is negligible at audio frequencies as I will demonstrate in this article based on fundamental engineering and scientific principles.......
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For the example chosen, at low frequencies the bulk resistance of the copper wire causes a power loss of around 0·008dB. At 10kHz the loss rises to 0·009dB if the internal impedance were absent, and 0·016dB with the internal impedance taken into account. At 25kHz these values rise to 0·012dB and 0·028dB respectively. Hence the change in relative signal level from near-d.c. to 25kHz, with internal effects taken into account is around 0·020dB. This is quite a small change so it is not obvious that it would be noticed in a practical audio system**...
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/skineffect/page2.html