Charlie,
The 5th (center) speaker is positioned on top of the subwoofer and the satelites are on the stands positioned about 4 to 5 feet to each side and approximately four feet to the rear of the keyboard. Position of the satellites will vary somewhat with the vocal EQs, the mic you are using, and its ability to supress feedback.
Good luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)