Guy, this is yet another indication that there's something wrong with your settings. You say that the sub wouldn't work unless you used the "Plus" setting, but as long as the speakers are set "Small" or on receivers such as the 772 which don't use the "Large/Small" terminology, as long as a crossover frequency rather than "Full Range" is set for the speakers, the sub gets the bass below the crossover frequency set and has to work.

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Enjoy the music, not the equipment.