I second what Donny (DNJ) said.  Roland KC amps, IMHO, have a rawer, harsher sound than a PA type amp.  I definitely hope you are dealing with a reputable dealer.  And I suggest you try many types of amps before buying.  As a child of the 60s, I find that sometimes I even like the sound of a good guitar or bass amp instead of a keyboard amp.  If you are using the amp for keys and vocals, maybe a PA system would be a better fit.