Bayne, if you've done the complete(rather complex)ARC calibration and room correction procedure carefully, the sub level part of it is what ARC "wants". As Chris points out, if you lower the sub level and then rerun ARC, it's going to reset the sub level to where it did before. So, if you try again and still think that the sub is too loud, simply lower the sub volume a bit and leave it.

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Enjoy the music, not the equipment.