Alex, I think that most of us thought that you were referring to an imbalance in sound level because of a more powerful amplifier(that's what I thought). As far as timbre goes, any competently designed amplifier is transparent and won't audibly affect the timbre of the speakers, so you should have no concern in that respect either. The only difference would be an ability to play the peaks at a slightly louder level, and that may or may not be significant for your use.

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Enjoy the music, not the equipment.