Indeed MC, the ADI-2DAC is quite frugal in terms of energy usage. To me, living in an area where Electricity is VERY affordable it's hardly a concern, yet I still conform to the Old School, and revert to the "Turn it off if you're not using it" thinking imposed upon me from a very early age.
From an Energy Waste standpoint, there are far greater Villains! The ADI-2 DAC is as innocent as a Newborn Child. Dozens of Wall Warts (phone chargers,etc) quietly nibbling away at Electricity in nearly any home, and that's just the beginning. I surely found no fewer than 12 "Chargers" in my Teenagers Room alone. All plugged in, and connected to absolutely nothing.
Whatever. I only Pay the Bills.
Best to All,
Vintage 2018 ADI-2 DAC. "Classic Edition"
Cables: Red Ones, and White Ones.
Speakers: Yes (2)