Zarak,
Most companies advertise (and i would suspect then to use) cables with a core of 99.9xxxx% OFC (oxygen 'free' copper). Some also adverstise this as the level of copper purity (i.e. copper w/o any other significant amounts of metals).
The cable comparisons usually debated comes from using same gauge, OFC brands which all tout they have the 'purest' copper cores.
Would people be able to hear the differnence between 2 copper cables (same gauge) different brand?
No. The results show statistical random selection.
Would people be able to tell the difference between a copper core and a silver core?
Now that is a good question to ask.
Perhaps Alan knows if this has been tried at the NRC before.
