So, you recommend using a 10 or 12 gauge AC power cord - I assume that translates into a 20 AMP AC cord from the AC wall outlet to the power center? I have 20 AMP AC wire to my circuit breaker.
The circuit breaker and dedicated line are rated 20 amps. Your PS Audio is 15 amps, so the wall receptacle would be a grounded 15 amp type. A 20 amp receptacle has different connectors.