I have my backplates connected to an ifi power strip that I turn on/off at the beginning and end of each session.
I go back and forth on this because I am neurotic. I even purchased a third backplate as back-up in the event of a failure.
Does anyone think the bias circuit is more susceptible to damage from the influx of power at turn on? I don’t know much about how this stuff works but it’s always the argument made for keeping audio equipment on.
This November will be 5 years with my M645s. Haven’t had many problems, knock on wood.