I am puzzled that you think the differences between interconnects and power cords is "tremendous."
Do you think interconnects and power cords make a bigger sonic difference than loudspeakers? A bigger difference than amplifiers? A bigger difference than cartridges?
That may not be the right question -- apples vs oranges.
The relative differences between cable A and cable B can bigger or smaller. Choose whatever adjective you want to describe the amount of difference.