This kind of DAC is designed to be left on all the time. Why do you want to turn it off?
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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!
Most if not all DAC's are by design meant to be left on. It avoids heating and cooling of the circuitry and provides for instant warm sound. As any serious listener will tell you any equipment will sound better after a warm up period. A number of high end equipment has a "standby/sleep" mode where power is maintained to the unit but at lower operating cost. DACS in particular require warm up time to do their best. I would leave it alone.