I liked the Yamaha the best (but, that's also why I use one). It just has more overall "presence" than the others

The Audya was a close second.

The Korg, at least in this comparison, sounded very one-dimensional.

Ian

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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.