Is a heavy guage power cord helpful?

[mtrycraft]

With my system, however, I can see a VOM monitoring the line instantaneously "wince" by a volt or two on it's dedicated circuit when my monoblocks are running full tilt at 20 amps playing something like Stravinsky.
rw

WOW, that much? Maybe you should check and make sure you have good supply caps in the amp to take care of that sag, or get better amps that can.