Hi, Magnepan's advice sounds correct -- usually this happens when an amp is driven to clipping trying to deliver a sound level in excess of the amp's clipping point. The amps you mentioned would seem powerful enough for most applications. How loud do you listen; how big is your room, and how far away from the speakers do you sit? You might also consider that a component in the chain ahead of the power amps is oscillating in the high frequencies. What preamp and source are you using?? Perhaps you need to look at those components... I have heard that certain cables can make amps oscillate, as well.
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