I checked the x4400H user manual -- walang sinabi rating if power is provided from USB port of Denon.
But sa Onkyo daw, according sa user manual:
- USB jack: A USB storage device is connected so that music files stored in it can be
played. You can also supply power (5 V/1 A) to USB devices with a USB cable.
try nyo nlang sa Denon niyo