I have a casio wk 500 and the newer wk 5700 keyboards that I play through a kenwood amp that I have had from the 70's...really nice with twin polk audio speakers. It sounds good but I seem to have to turn the bass knobs on the amp all the way down and the treble mostly up to get the best sound. Even then it sounds really "hard", like the difference between listening to compact discs vs vinyl records. The keyboard has good stereo effect through the system. Would something like "keyboard amps" such as from roland be a better system...they seem to have amp and speakers combined...how does the stereo effect work with this? Hope this makes some sense to anyone? Thanks, Bill