Ken,
Just connect the 3000's 1/4-inch outputs to the powered mixer's standard inputs. Connect the speakers to the mixer's output and you're ready to go.
Good Luck,
Gary
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Travlin' Easy
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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.)