My experience with Kbs and mics amplification:
1-For small performances (Only my Psr9000)
2-For medium performances(Only Kb):
Two Yorkville 100watts(Made in Canada) powered speakers,light and easy to equalize.
3-For big performances(Kbs and mics):
One Peavey XM12 powered mixer (500w rms)
Two JBL TR 105 speakers(300+300W rms)
One JBL powered subwoofer(300W rms)
One 30 band stereo Yamaha Pro equalizer and Quadraverb in loop with Psr9000(Bravo! Uncle Dave)
Mbr,Chico