Rob, no different suggestions, just to confirm that the increase that was spoken of is an increase in the sub trim level(which increases the voltage output)on the receiver(e.g., the +3 that you've now set), not an increase in the sub volume level control. In fact, as you now see, the volume control should be turned down when the sub voltage output on the receiver is increased, so that there's no overall change in the calibrated sub level.

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Enjoy the music, not the equipment.