Can a better power cable make a difference if NOT plugged directly into an outlet?

Unfortunately the problems with your AC power is likely outside of your control. The power companies don't care how much interference or DC there is coming from their mains into your house. In a lot of cases they don't even maintain a solid 120 volts. I am a believer in power conditioners and use an Equi=Core 1800 MKIII, but ANY decent power conditioner is better than none. Any power cable that is capable of carrying more current is better than the typical 16 gauge lamp cord. But a power cord can only help from the socket downstream and unfortunately a lot of our power issues are upstream. A dedicated 20 amp circuit can be a big help. Just my opinion.

@vthokie83   When you installed your dedicated lines did you use s special audiophile wire?
 

 I installed two dedicated home run 10 gauge lines 15 years ago and the electrician used 10 ga. THHN (jacketed spiral wound aluminum clad copper).  The lines are in an aluminum conduit per code because they run along a beam in the garage, i.e., not in a wall until they enter the listening room.   I also installed two FIM Gold outlets for the dedicated lines.  I’ve often wondered if solid core ROMEX or an audiophile wire would improve the sound.

Txp1,

i’m out of town, and will fly home in a few hours….I’ll look then, just can’t remember off the top of my head

Make Audio Great Again?

I am not a cable denier and I have Transparent Audio mid level cables through out my system the Premium and XL's and a smattering of other brands like Cardas and Belden. 

Well, then there are the MAGA nutjobs...

Love what the folks at Schiit say about Power Cords and IC.

6 Power Inlet
Plug the end of the supplied IEC cord in
here. You can also use fancy audiophile
types, but they won’t really do anything—
what about the thousands of feet of crap
copper cables in your walls, huh?

Beyond Just Technology: SuperUltraHyperTechnology
PYST cables are made from only the finest 6-nines Unobtanium™ alloy, molecularly assembled in our Alternate Universe™ reality-distortion tesseract field , using a secret geometry reverse-engineered from crashed UFOs, painstakingly smuggled out of Area 51 by deep-cover operatives. Performance is further enhanced by the use of a QuantConnect™ quantum-entangled pair of transmission interfaces, held at absolute zero by our exclusive Stasis Field™ technology. The cables are then wrapped in NanoAeroCap™, a nanotechnology-enabled aerogel anti-capacitance insulation system, featuring Fractal Interleaved Geometry™ to create negative inductance for maximum audio transmission quality.
 
Or, er, well . . . again, no. These are nice, high-quality cables, with solid, reliable connectors. That’s it. Hope you like them!