The info that i have on the Sparks' state that they are a small two way with a 5" mid-woofer. If that is the case, you probably need more speaker, not more power. 60 "tube watts" should be enough to drive such a speaker well into break-up. I think that you are hitting a point where the speaker is crying out for help, not the amp. Not being there to check things out first hand, this is strictly a guess and someone more familiar with your speakers and / or your integrated may be better suited to helping you. Sean
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