Do I need 10 gauge power cord if I have 10 gauge from panel?

@ghdprentice :"It is unlikely a 14 gauge power cord is not negatively impacting the sound." That is poor grammar! Do not use a double negative in one sentence. The correct sentence is: It is likely a 14 gauge power cord is negatively impacting the sound.

@ghdprentice : I see on eBay a Hurricane listed at $1842.60. That's a lot of $$$ for 3 meters/9 feet of wire! Also listed is an AQ Thunder for $600. Again, a lot of moola! Do you really believe that you can hear a difference between the Hurricane vs. the Thunder? A degreed electrical engineer will tell you otherwise! 

JasonBourne52

 the benefit of a 10 gauge wire from the electrical panel is to achieve a benefit from lower impedance and Power availability for all those Quick changing frequency needs. Clearly there's enough power to run the device but that's not the point.

The power cords would be connected to 600 W mono blocks.  
 

The biggest improvement is in reducing resistance per foot.  If you ran 30' of 10 gauge it's still better than 30' of 12 gauge.

Just make sure your breakers are right sized for the end use.  Meaning 15 or 20 Amps.

I have been in this hobby since 1976. I have yet to hear a sonic difference between any power cords! I know enough about physics and engineering to question the veracity of the "golden ear" claims for the superiority of one power cord over another.