Magic, pure magic
My background is Audio retail and I have managed several Audiophile chains. Many years ago on one of my periodic store visits I came upon a tape deck demonstration. The assistant had two 3 head tape decks wired into an amp with 2 tape monitors. Both were recording and the customer was invited to choose one. Well, I thought the sync seemed pretty close but said nothing and, yes the customer heard the difference clearly and purchased one.
When the gratified assistant returned, I pointed out to him that he was actually switching the INPUTS and so both decks were effectively out of circiuit.
When it comes to wire my standard response is that if you spend a fortune on magic string, you will certainly hear a difference - there probably won't BE a difference but you will certainly hear one!
