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Check out this article:

http://gizmodo.com/5604308/deep-inside-xbox-360-kinect-the-interface-of-microsofts-dreams?skyline=true&s=i

 

A little snippet:

The Kinect's size and shape is dictated almost entirely by the 4 microphones located along the bottom. It has to be precisely that large to accommodate the mics and the exact positions they need to be in. The mics, and their placement, is the result of research in 200 homes in the US, Japan and Europe. When you buy a Kinect, one of the first things you'll do is calibrate the audio to fit the room it's in. It's creating an audio profile of the room, mapping out the room's reflectivity. And if you majorly re-arrange your furniture, you'll have to do it again.