ATC PA 65's will do the job but you are talking mega-bucks and back breaking work to move them.
I would be cautious about using home hi-fi speakers or studio mini-monitors for this task - if you happened to get aggresive on the keyboard then you might blow them up real easy - anyway they will distort so easily that you are unlikely to impress anyone.
A cheap alternative (with lots of bass power and a nice portable package) might be a Roland PM30 drum monitor - it will certainly get you loads of room filling bass and dynamics - enough for small venues. However the sound is nothing like the quality you can expect from the PA65 which is installed in high end venues often along with a bunch of subwoofers for dance and jazz clubs.
If you want "realistic" grand piano sound then you you'll need 110 db SPL capability and I am not aware of any portable home hi-fi speakers that can do that.
I would be cautious about using home hi-fi speakers or studio mini-monitors for this task - if you happened to get aggresive on the keyboard then you might blow them up real easy - anyway they will distort so easily that you are unlikely to impress anyone.
A cheap alternative (with lots of bass power and a nice portable package) might be a Roland PM30 drum monitor - it will certainly get you loads of room filling bass and dynamics - enough for small venues. However the sound is nothing like the quality you can expect from the PA65 which is installed in high end venues often along with a bunch of subwoofers for dance and jazz clubs.
If you want "realistic" grand piano sound then you you'll need 110 db SPL capability and I am not aware of any portable home hi-fi speakers that can do that.