buonassi
Headphoneus Supremus
They are powering their receiver from the external USB source! Seems weird to me. First, the DAC shows up in Windows device manager when it is turned off and unplugged from the power source. Second, device manager reports that the DAC requires 100mA. If, magically, the DAC starts using internal power when powered on, then Windows would have kicked it out and re-enumerated as a different device that requires 0mA. That doesn't happen.
FWIW, my mac mini shows the 100ma requirement as well under "system report" USB section. Just in case anyone was wondering if this was isolated to windows.