You'd think a high-end equipment manufacturer wouldn't consider any of these factors when including a power cord.
Without an actual repeatable standardized measurement, how can you accurately judge something? Any variation is just a matter of opinion without it.
All in all, there is a far greater chance of compromise with the long path of wiring from the generating plant, through the switching stations, step up-down transformers, house wiring, and even outlet contact pressure, versus a properly rated 6' power cord. Even less if it is permanently attached.
If there is a perceptible difference with any power cord, something is seriously wrong.
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