You are welcome, Elizabeth.
BTW, although a regulated voltage gain stage will be relatively unaffected by power line droop, the voltage gain stage is not the only gain stage in the amplifier - there is a power gain stage, i.e., the output devices, and they would still reach clipping at a lower output level if the line voltage drops - and, with a large power amp running hard, the line voltage will drop, unless one is running large wire on a high-power circuit, say, 10-gauge wires in a 20-amp circuit.
However, I cannot conceive of any real-world musical listening experience that will cause an amp to use that much average power, and I do not think (though I have not tested this) that millisecond-long peaks of max power would create line droop - those peaks are easily driven from the reservoir storage capacitors in the power supply. In my crazy youth, I listened at loud enough levels to observe incandescent lights dim and brighten in time with the music - this was line droop. it was the power amp doing this, and, most specifically, the power-gain stage of the power amp. But that was VERY loud in very inefficient AR loudspeakers.
It is interesting to note that in musical instrument amplifiers, of which I have seen many and all of which measure poorly as hi-fi amps, power droop is often seen as a good thing - the "sponginess" of the DC supply, either coming from a tube rectifier or a heavily-loaded diode (with but little storage capacity) gives the amp some of its flavor. In musicians' world, the amp & its flavor are part of the instrument, and are not a reproduction tool as in our world.
Cheers!
