The KC150 do not deliver enough lows.
It's good enough in a band situation(where you have a drummer and a bassist) but not for a solo keyboard player.
You need a solid PA system for that.
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76