Your power cable can act as an antenna that picks up noise from magnetic fields and radio interference which is all around. If the power cord is shielded properly, then it will minimize the introduction of noise from these EMI/RF fields.
It does absolutely nothing as far as improving "power flow" or current draw or anything to do with electric power. The improvements you hear with power cords are the reduction of the noise floor from the EMI/RF noise rejection - which is what may happen if you "run the Romex to your hifi".
Some cheap cords can do just as good a job as the ones that go for a grand a foot with respect to noise rejection. Keep an open ear before you spend the big bucks needlessly.
It does absolutely nothing as far as improving "power flow" or current draw or anything to do with electric power. The improvements you hear with power cords are the reduction of the noise floor from the EMI/RF noise rejection - which is what may happen if you "run the Romex to your hifi".
Some cheap cords can do just as good a job as the ones that go for a grand a foot with respect to noise rejection. Keep an open ear before you spend the big bucks needlessly.