Yes, but only if you use the
line out of the powered mixer/amp. The standard outputs that would normally go to the speakers would blow the Mackies, while the line out would be the same as the line out from your keyboard.
Cheers,
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.)