I've been in contact with folks at Ayre on serval occasions, including a scolding from Charles Hanson for placing a Bryston 10B high-pass filter between my (or maybe his) KX-5/20 and VX-5/20, but never asked about power cords. I think I understand the logic of millercarbon's argument, and it has altered my thinking about power cables a bit. Manufacturers do not supply interconnect nor speaker cables, so I rely on Cardas for those.
Thanks for all the thoughtful replies.
db