Sat, the Emotiva may be a mystery to me, but in general protective circuits take effect either because of too much heat(unlikely in your case)or too much current. LFE occasionally appearing during movies does require more current, but even well-designed receivers(e.g., Randy's 2805)should be able to handle this at reasonably loud levels. Yes, taking some of the load off with a "small" setting and probably a 80Hz crossover for the M80s should help, but it's disappointing if the amplifier needs the help.

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Enjoy the music, not the equipment.