10-12-05: Nsgarch
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IMO, power amps are the acid test for power cords. Or to put it a different way: If placing a particular power cord on the power amp doesn't improve the sonics of your system -- specifically: tighter bass, better center fill of the soundstage, better transients and blacker noise floor and (belive it) louder volume at a given preamp setting, then it probably won't do anything special elsewhere in your system (where differences are sometimes a little harder to identify.)
I will disagree with you on this.
IMO, power amps are less likely to display any significant difference among power cords. Especially good power amps with a properly designed power supply.
So saying that if the cord does not make any difference on the amp means that it won't make a difference on any other component in the system just hasn't been my experience.
As a matter of fact, it is the other way around. If a cord makes a difference on digital, that doesn't mean that it will make any difference or will have any positive effect on the amplifier at all. Power cords are not only system-dependent, but also component-dependent.