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.
Yes that's what I thought I'd do for my upstairs, as yet unpurchased thing.
@Chalfie started
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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.