@atmasphere
"Its a simple fact that if one is measuring an amplifier and their AC line has insufficient current then there will be a Voltage drop which should be corrected if one wants to make accurate measurements. A typical home AC line is 15 Amps. If you are measuring an amplifier that really should be plenty of current for all but the very largest of amps made. Our MA-3 makes 500 Watts and is able to run on a 15 Amp line; a 1000 Watt solid state amp could too so I really do not understand what your beef is. At any rate anyone doing such tests should have access to a variac. Its a basic sort of thing when doing test and measurement."
A variac is a variable transformer, it can do nothing with regards to compensating for the sag that occurs in an AC line when the equipment connected to it draws more current than the mains can provide unless maybe if they’re including some form of AC regeneration in them now since I know that kind of device is available to hobbyists but I don’t know how if at all that would compensate for the sag. Other than it’s ability to vary the amount of voltage from the AC line, it’s a passive device. Basically, a rheostat. I think these abrupt segues from you is misleading and an additional distraction from my original premise which you refuse to address.
I would like to see your MA-3 independently tested and evaluate the results for myself. I’m sure I’ll encounter the same discrepancies in it’s actual tested values as presented in your specifications that I commonly see in bench tests and other manufactures claims.