Yep, like everyone thought and what most recommended to check prior to buying the QSC. My guess is if you plug back the Onkyo and drive it to its max capability without clipping, it won't shut down and it probably dose LIKE the M80s. Now, if you want the power given by the QSC, it's different story but not your original one. In Any cases, I'm glad everything worked out OK and you're enjoying your system (at least until you'll become depth laugh )

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."