Which power cords have high resolutions and separation??

Lots of evidence of this these days aside of power cables,tone controls.

None of them, but believe what you want.

Take your pick of any good quality wire.  Need not cost much.   For power amps current delivery is more important.   For line and phono level and digital devices, shielding is a good thing. 

AQ Thunder are very good power cords ,and very nice Copper connectors, retail around $1k perrotta consultants 

give very good service and pretty decent deals especially if you buy more then one item .