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Question: Info for a subwoofer.

I have an Onkyo TX-SR 806 receiver. mirage nano 5.0 speakers. The room is 19 ft X 13 ft. should I get the onkyo SKW-204B or the polk psw 10 audio subwoofer. I don't really need a loud boom box, just enough to get the sound of the movie or cd. Thanks for any help you could give me.