Anthony, on occasion the mains are in fact drowning out the center channel dialog, but it isn't because the calibration is incorrect. Some center channel dialog in movies is mixed too low and when a lot is going on in the other channels, the dialog can't be heard clearly over it. The center channel can be bumped up 3-4dB in those situations, but then they're too loud in other situations if they're not turned back down.

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Enjoy the music, not the equipment.