Major, it's rather unlikely that a +10dB adjustment to the sub and the surrounds would be necessary to properly calibrate them to equal levels with the others. It may be that you want to "hear" that money that you spent on them, but a sub shouldn't be audible as a separate source and the surrounds likewise, except when something in a separate surround channel in a 5.1 source is meant to be. Yeah, you should take Steve up on that calibration offer; you might well find that you've got both the sub and surrounds too "hot" now.

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Enjoy the music, not the equipment.