If your amp has usb sockets you should be able to use those for power (although sometimes they're not powerful enough, I've had to use a 2x USB to 1x micro USB to get round that before).
Obviously for sound you'll still need to plug in via the HDMI/optical/3.5mm jack.
If your amp has usb sockets you should be able to use those for power (although sometimes they're not powerful enough, I've had to use a 2x USB to 1x micro USB to get round that before).
Obviously for sound you'll still need to plug in via the HDMI/optical/3.5mm jack.