Are the two prongs on the original cord identical in size? If so the first thing I would try is reversing which prong is inserted into which slot in the outlet.
Good luck. Regards,
-- Al
Any recommendations for PCs that help with imaging and maybe deepen the soundstage?From a technical standpoint I doubt that can be predicted with much if any confidence. I would expect the sonic effects that may result from upgrading the cord to depend as much or more on the specific design of the Marantz unit, and on the voltage and noise characteristics of the AC at your particular location, and on the technical characteristics of electrical noise that may be coupled into the Marantz from other components in the system, than on whatever intrinsic sonic characteristics the cord itself may possess, if any.
Good luck. Regards,
-- Al