Graham in UK

Your opinion please on the best way to achieve the highest fidelity in an sound reproduction system for a good keyboard. I play alot of times in small places where it is mainly jazz and everyone is listening - sound quality is quite important. I play through Barbetta 31C - a pair of powered speakers - supposedly good quality - but my home stereo has better fidelity when I play through that system - as do my cheap headphoes. Do you think stuff like the Mackie SRM450's or Yamaha MSP10's are the best way to go for high quality?

Mike H