A keyboard amplifier or acoustic combo? 
I do not
feel either of the above.
I also realized that question was unclear.  there are vocal mics, what I
am amplifying is the source for the backing track, i. e. if I am playing
the track  from a laptop, the active speaker or amp is suitable for
that   sort of  equipment.
If there is a burned cd involved then the  speakers / amp is suitable  for
the best tool for playing  / pausing  when the materials are burned.
Assuming the laptop itself does not such a drive.