Polk 4shot echo's

Hi there.
Freinds and i all have the polk 4shots. If i play with someone that doesnt have them everything is fine. As soon as a friend that does have them comes on a echo starts, Its for everybody. If there are 3-4 of us the echo gets worse. It doesnt pinpoint to any person. Any combination of 4shots gets the echo.

Any idea what is wrong? Bad mic, cycling thru the old and new mic? Somehow going thru kinect?

Any thoughts would be greatly appreciated.

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