This is probably coil whine coming from the power supply at certain loads, which is common with switching mode PSUs.
It can often be fixed by identifying the component (normally an inductor) and covering with hot glue.
However, you will surely void your warranty, so I would suggest to use a power strip with a master switch, when you don't use it just turn it off. If you are willing to spend some extra money there are network managed power strips that can be controlled from a smartphone, just search for "smart power strip", for example :
https://www.amazon.com/Protector-Appliances-Individual-Schedule-Required/dp/B076VRH9WP
It can often be fixed by identifying the component (normally an inductor) and covering with hot glue.
However, you will surely void your warranty, so I would suggest to use a power strip with a master switch, when you don't use it just turn it off. If you are willing to spend some extra money there are network managed power strips that can be controlled from a smartphone, just search for "smart power strip", for example :
https://www.amazon.com/Protector-Appliances-Individual-Schedule-Required/dp/B076VRH9WP
I’m a happy owner of a DAC3 HGC with the exception of one thing that really bothers me. When the device is powered off, but still plugged in to an outlet, it emits a faint high pitched squeal that is somewhat jarring in a quiet setting (or maybe I just have sensitive ears). I have it in my bedroom, and I find myself either physically unplugging it or leaving it powered on overnight so that it doesn’t disturb my sleep. Benchmark sent a replacement when I raised the issue a few weeks ago, but the second unit is now also exhibiting the same behavior. Are there any other owners of the DAC3 who are experiencing the same issue?