Regarding the last few posts, an additional point that will be obvious to some but I nevertheless think warrants mention in this kind of discussion, is the possibility that things other than the performance of the power cord may change during the breakin period.
Examples being changes in AC line voltage or AC line noise characteristics, and ongoing breakin or aging of system components. Tubed components perhaps being particularly susceptible to the latter possibility, at some stages of their life-cycle. Also, the possibility that cartridge suspensions or speaker drivers may be in different states of flexibility due to differences in usage patterns that occur from time to time. (While I haven't particularly noticed that kind of effect with my speakers or with the cartridges I have used, it certainly occurs to a huge degree with my Stax electrostatic headphones). And, also, the possibility that the components in the system may be in unequal states of warmup during the various stages of the comparison, given especially that some folks believe that solid state components can take 24 hours or more to reach a stable warmup state.
As I see it, without a very disciplined methodology it's especially easy in audio to attribute a perceived change to the wrong variable.
Regards,
-- Al
Examples being changes in AC line voltage or AC line noise characteristics, and ongoing breakin or aging of system components. Tubed components perhaps being particularly susceptible to the latter possibility, at some stages of their life-cycle. Also, the possibility that cartridge suspensions or speaker drivers may be in different states of flexibility due to differences in usage patterns that occur from time to time. (While I haven't particularly noticed that kind of effect with my speakers or with the cartridges I have used, it certainly occurs to a huge degree with my Stax electrostatic headphones). And, also, the possibility that the components in the system may be in unequal states of warmup during the various stages of the comparison, given especially that some folks believe that solid state components can take 24 hours or more to reach a stable warmup state.
As I see it, without a very disciplined methodology it's especially easy in audio to attribute a perceived change to the wrong variable.
Regards,
-- Al