Kijanki is right. Consider also, other, reasons why good power cables are beneficial for audio. Lower (contact) resistance for example, quicker rise times when pulling current from the net, less cross-contamination (EMI & RFI) by shielding or by geometry type between components. Sometimes changing one cable can make a difference for another cable in your system. Separation (less noise pickup) can have an effect, don't use sharp bends, cross at 90 degrees. I can also endorse Willie's observations.
10ga solid core is my minimum