MECHANICAL ISSUES: Low Frequency vibrations (60-240 HZ harmonics) cause noise in the power supplies of many components. The supply can be poorly seated and even with perfect power - create mechanical resonances. ELECTRICAL ISSUES: Leakages, magnetic field effects and induced noise based upon how well the power supply is shielded and physically coupled to the chassis. Overall shielding and grounding of the component is quite important. All can be improved with this cable.