As you don't want to touch the power chain going *to* the dac, an option is to install a heavy duty (hi amp) switch after the IEC receptacle on the dac... messy affair! And yes, do AVOID plugging units into an empty PS (i.e. one that's off).
At the end of the day, it seems best to leave these things on, despite the inconvenience!
At the end of the day, it seems best to leave these things on, despite the inconvenience!