I used "audiophile" power cables on my Crosby Quad 63s. Once my ’57s were restored I used good quality standard power cables (part of the restoration by Electrostatic Solutions was converting the connectors to more standard types).
They sound fine, actually better than ever. I bought them in 74, they were made in ’73 and were my reference until around 1990. Now, they run in a second system, largely period, and great fun. Kind of how far we haven't come in almost 65 years.