Is a heavy guage power cord helpful?

[mtrycraft]

I Intended To Ask This Question In Regards To An Amplifier Pwr. Cord.
For Example... Along With My Ps Audio Hca-2 Pwr. Amp. I Received A Free 8 Ga. Cord And The Stock 14 Ga. Cord.
I Tried Both, And The Fatter One Won.
Is There A Scientific Reason For This Or As You Infered... I Just Wanted To Belive?
Zf,

14 ga should be more than enough to handle most amp loading. It is safe for 15 A and rated for 20 For safe operations. All depends on the insulation type, not the wire ga, especially for short runs. So, that 14 ga should handle 1800 watts easy.

As was stated, if it is free, use what makes you happy. As to audible differences, hogwash. But, a credible DBT will convince me otherwise, or measurements at the amp output.