I used the usb-c port to power the device from a 5V/3A charger but also from a denon receiver, which has a 5V/1A usb port.
Everytrhing was fine, I tested for a few hours… is it safe?
If the hardware is half descent (I’d say Denon is, your player isn’t a Chinese cheap low quality build) and proper,non-cheap cables or charger are used, yes why not ?
included dc power supply is 12v/1a that’s why I have some thoughts
In that case
Why not use the power supply that came with it?
To far away from wall outlet?