Trevor Wilson wrote:
I use an amplifier which has no speaker relay protection systems. Therefore,
when it is unplugged, it can still deliver power to the speakers, for as
long as the main capacitor banks can supply it. The main filter caps total
250,000uF. This means the amplifier can deliver a handful of Watts for
several seconds. Plugging and unplugging the amp from the 240VAC mains
supply is inaudible to all listeners. Therefore, there can never be any
difference between power cords.

Is there not another angle to look at (says he throwing fuel on the
cynical fire...) and that is when the mains power supply is noisey.
While I can appreciate a mains cable ain't going to make any difference
with a clean power supply, to what extent do these noise reducing mains
cables with their ferrite rings and platted cables reduce an
interference that may be inherent in the supply? Of course an amp that
removes all such interference before the amp power lines will not show
any difference, but will a hifi component with a less than optimally
design power supply benefit from a "noise reducing" cable?