Jeff, as indicated in the article by Alan, separate the front speakers by about the distance of your seats from them(i.e. 15' or a little less). Put the side surrounds about 6' up and directly to the side. Put the back surrounds about 6' up and separated in a similar fashion as the fronts, i.e. about as wide as the distance they're behind the seats.

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Enjoy the music, not the equipment.