Bernie,

The only way to overdrive the speakers with the setup you described is to turn the keyboard's volume up too loud. Naturally, any speaker can be overdriven and blown, therefore, volumes should always be kept at reasonable and comfortable levels.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)