interesting read ...a lot of assumptions are made ie lets assume that etc....  its a bit thin on conclusions   to ?  ie its doubtful you'd be able to tell the difference between copper and silver ....It then becomes obvious to me  that this is just theoretical peice, other wise it would have said something like.. the audio differences between the conductors was clear.

Having built identical  ic's from copper, silver, aluminum and gold  I've heard the change in flavour they make.

The maths looks ok ...

some interesting bits on stranded cable too.