The Big Story: Microsoft debuts the Xbox One
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Not necessarily, the power port could just be for a cord (the PS3 uses just a cord with no brick and it has a detachable cord like this one seems to have).
3 days ago on Xbox One: our first look at the new console, controller, and Kinect 1 reply
A built in amp would only increase manufacturing costs and most potential buyers probably already have a receiver and speakers anyways.
3 days ago on Xbox One: our first look at the new console, controller, and Kinect 2 recommends