Thanks for the suggestions Dave. I did try turning all effect off. I thought about reverb and delay as the initial culprits but still got that " dull echo like effect" which is best I can describe it. I ran my Yamaha YPG 535 through the Peavey KB1 amp and it always sounded fine for piano. The Peavey doesnt have effects- just a hi, lo "equalizer" on each channel, so I tired turning both knobs down all the way on the amp too. No amount of tweaking either on the keyboard or on the amp made the piano sounds any better. However, as I mentioned the powered little 3 inch Mackies seemed to do the trick. Not every EP sounds great, but the acoustic piano sound a lot better. I have one register set for 2 of the Grands layered with the lower -1 octave and the upper at 0 octave. Sounds pretty good. For someone like me who doesn't gig anymore, I think you are right, the powered speakers might be the way to go.