• Powered yes, output as in audio output? No.

  • Thought not. I have one, but I'd quite like the thing it's plugged into (amp) to be able to power it. There are probably hundreds of good reasons not to do this.

  • 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.

  • Does your amp not have a usb socket? Take power from that. Then use the 3.5mm line out (or even the mini optical inside it, if your amp has an optical digital-in) to take sound into the amp.

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