Re: digital sound projectors
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I assume I'll want the four speakers for the walls, a receiver (I don't even know what a receiver does), and a subwoofer?
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You may also want a center channel speaker. (or not, some people don't like them.)
What a receiver does is switch between sources (e.g., between your cable box and your DVD player) and sends the signals to the speakers. E.g., your DVD player has a digital output that the receiver will separate into signals for each of your speakers.
Search this thread for recommendations on home theater in a box (which has the receiver and all the speakers).
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