What difference do power cables make?

I cut the power cord off of a Huge old deep freezer.

It was around 6 gauge. Ordered some good looking 

Nice quality plugs from China...... I could hear it quickly. 

To be fair, the improvement was subtle, yet noticeable if

You had a ear that was accustomed to your system. 

A welcome improvement 

@thyname Thanks for your history with Pangea. I will definitely circle back to power cords again, and I appreciate your recommendations. Saving for future use. 

If your equipment isn't grounded and your interconnects have poor shielding then you certainly need the best shielded power cables you can find.

You'd be better off grounding all equipment first. An RF Router Plug-in from Russ Andrews with separate grounding cables from each case back to the router should be your first consideration.

Double shielded interconnects are highly desirable.

If you still have RFI (Radio Frequency Interference) then go with shielded power cables.

“Do you feel that it was worth the additional investment?”

On Power amplifiers especially.  

Love this power cord for dummy’s stuff again and again. Especially the you have to train your ears and know your system to hear a difference BS, that equates to no one else can hear it so it doesn’t exist…dah. Good equipment isolated wiring proper gauging if necessary power conditioner. No tripping down the yellow brick road to a snake oil pit, education common sense science…Walla !!