A friend of mine uses two QSC K8's on his PSR-3000...it sounds pretty awesome.

These speakers are super high quality build, powerful, and very, very, very reliable.

Ian

PS...Did I say they are reliable?
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.