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Interconnects, speaker wire, power cords. Ask the Cable Guys.

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AC from the wall is 'messy' (not a clean sine wave, plus other 'waves)

Posted by Smelly_Socks on December 16, 2016 at 11:39:48:
I am not up on the total jargon of power delivery, but..
The so called sine wave from the wall is not usually very clean. It has all sorts of irregularites and spikes etc. Due to other stuff somewhere on the line, even far away stuff. I think a lot of power cord 'stuff' is to clean up the waveform. Dampening spikes etc.

Another factor not really discussed is the phase variance due to capacitance etc. The actual power may not be lined up with the rest of the wave.. So a power loss (primarily important in factories) can happen.
This is the math of AC power I am at a loss to understand. Non the less it does exist and affects power delivery. Seeing graphs online of the parts of the waveform not lining up is all I have seen. Some conditioners say they fix this too.

Now in a audiophile system these factors can affect the sound.

So a power cord can 'perhaps' have some effect on these things.

The following is only my personal experience trying to explain what I hear. not some physics lesson!:
Also IMO the wave can be 'fat' or 'thin'. Seems plenty of cords and conditioners make the sound more resolved, but also thin.
Like the difference tween tubes (fat) and transistors (thin)
Like the cord restricts the waveform in some way Even using 10 gauge wires... Vs some which do not, even though those make the sound better.