Go on, amaze us how say an expensive audiophool speaker cable that has the exact same electrical parameters as a cheap equivalent twin flex can make any difference.
Sure it can,
when used correctly.Find a subject who is an audiophile. (Non-audiophiles may not have the ability to discriminate between high-end audiophile cables and cheap flex, even if they are professional recording engineers.) Ask the subject whether he wants to listen to the cheap flex or the audiophile cable first, install that and let him listen. When he requests changing to the other cable, do so and let him listen again. Repeat as necessary. He will hear clearly that the audiophile cable sounds better.
WARNING: Be very careful that you do
not accidentally install the cheap flex when the subject has asked for the audiophile cable, or vice versa. Doing so will critically damage the audiophile cable and actually make it sound
worse than the cheap flex. (And, probably, void the warranty on the audiophile cable.)