Hi Peter,
Yep, volts and amperes are certainly related. I'm not an electrical engineer either, but in theory if there is a voltage sag in a circuit, it would seem feasible that overly aggressive protection circuitry might shut down an amplifier.
Protection circuits can monitor any combination of current flow, voltage and thermal factors, so depending on their implementation, they may react quite differently from one brand or model to another.
JohnK may weigh in here at some point. I'll also check with Tom Cumberand, Axiom's R&D "conehead" (as he refers to himself) who is an electrical engineer and an amplifier designer of long experience.
Regards,
Alan
