Being a designer of audio equipment, I try to debunk misinformation, and unfortunately the audio field has more of it than other fields.

The EMF around a power cord is not going to have any sonic impact on a properly designed piece of equipment. If somebody is concerned with the EMF being picked up by interconnects, I need to remind them that good interconnects already have shielding which protects them from interference. In any event, it is good practice to keep AC power and low level audio cabling at least a foot or so apart, and never have them running in parallel for any distance in order to eliminate inducted interference (this is standard installation practice in professional installations, and it should be followed in the home).

If someone is concerned about EMI/RFI being radiated from a power cord, this is what power line filters are for - use them! They are inexpensive and effective if this type of interference is a problem. Tripplite "Isobar" series filters are extremely good at stopping EMI/RFI from reaching equipment, and stopping digital clocking artifacts or switching PSU noise from one piece of equipment from entering another.

Once the AC is inside the equipment, in a good design, it is kept far away from low level circuits, and proper shielding is incorporated. The path of the 120VAC is short; generally it goes through a fuse, a "hard" on-off switch, a surge limiter (in power amplifiers), then to the power transformer - all of this is far away from sensitive circuits.

So whatever is used for the short transmission of AC from the outlet to the IEC plug on the back of your gear is not going to have an impact, and whether or not the EMF is escaping from the jacket of the cable or not has no bearing on anything.

This is not flaming - I'm just passing on solid engineering practice, which has been proven over decades of use within the audio industry.