Upgraded Power Cables are used by many audio/video enthusiasts who recognize the improvements they provide for many components. I would like to suggest that you complete a system analysis and speak with a knowledgeable dealer or Straight Wire staff to determine which power cables are most beneficial for your system.
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 are based on how well the power supply is shielded and physically coupled to the chassis. Overall shielding and grounding of the component are quite important.