Randi's response and acceptance to the acceptance.
http://www.randi.org/joom/index.php?...7&Itemid=27#i1
Basically the crux of Randi's challenge is this.
...there is a point beyond which no ear can benefit from the expense of conductors...
And that,
Detecting differences between two varieties of excellent conductors of low-voltage electrical signals – speaker leads – via a direct auditory test, would fall within this usage.
The usage being 'paranormal'.