May I have a suggestion? A power cord that gives a quieter background means it
has superior shielding against electrical interference. So why don't you contact a
few cable manufacturers and ask them to provide you with the design spec and
the test result of the shielding or noise rejection capability of their cables. Even
the regular coax lab cables like the RG58 and RG59 have design spec, a carefully
designed power cord costing $500 a piece should have even more detailed
design spec and more complete test results. Once you have that information,
selecting the right cable for your requirement should be much easier.
has superior shielding against electrical interference. So why don't you contact a
few cable manufacturers and ask them to provide you with the design spec and
the test result of the shielding or noise rejection capability of their cables. Even
the regular coax lab cables like the RG58 and RG59 have design spec, a carefully
designed power cord costing $500 a piece should have even more detailed
design spec and more complete test results. Once you have that information,
selecting the right cable for your requirement should be much easier.