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

@ditusa : my apologies after seeing your big Crown amp. How many wpc at 8/4/2 ohms? My Perreaux 2150B does 340/680/920@8/4/2 ohms. I will look and see what gauge power cord is on it. Also I was wondering if the MacIntosh 1000 watt mono amps use a 10 gauge or better cord?

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. 

@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! 

NO! Because even a 14 gauge power cord is rated to handle 15 amps/ 1500 watts. This is the same rating for the typical breaker box/AC outlet found in most homes. That's a lot of power! Increasing the size/diameter of a power cord is only required if you plan to use an arc welder! Then you need a lower gauge/thicker cord. For a 200wpc amp a 14 gauge cord is perfectly fine. You don't need a garden-hose size power cord!

I am unaware of any amp requiring a 10 gauge power cord. What amp/amps do you have? Why did you install 10 gauge wire to the breaker box/AC outlet? None of your gear combined will draw that much current. Stoves, refrigerators and washing machines/dryers run on 240 volts/30 amp circuits. 

@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.

Shunyata's device showed that a typical 14 gauge power cord's resistance is perfectly adequate for any audio component. No effect upon transients!

@jumia : I understand the necessity of having low resistance in a power cord for transient peaks. Shunyata designed a device to measure this using transient speed compared to power in watts. They found that transient speed became a factor (slowed down) only when the 10,000 watt level through a power cord was reached! So below 10K watts a 14 gauge cord is perfectly fine! No deleterious effects!

Shunyata - a "bona fide" high-end company - was attempting to prove that lower resistance was important. They proved it doesn't matter! So 'philes discard those garden hose power cords and free yourselves from delusional thinking!

My father's table saw would sometimes trip the 15amp panel circuit breaker when cutting plywood. I doubt your pair of 600 watt amps would do that even at clipping!