Scott,
I have sold many NP-30's at my store. I too agree that the internal speakers don't make the piano sound very good. However, when I plug it into an external system, the piano really comes to life. All of the customers I demo this too are given a chance to hear it both ways. My comment is that the internal speakers, one on each end of the keyboard are fine for practicing, but to really heara the grand piano at it's best, use an external amp.
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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com