Drew, in the particular case that I mentioned it's the left surround that was calibrated at +4. If I set the receiver to show no surrounds the +4 adjustment isn't relevant. The +2 calibration on the right front speaker becomes the controlling factor and the maximum setting on the volume control is now 77.

Again though, if you're seeing a difference of 26 on the maximum volume setting, this can't be explained by the calibration adjustments. They can't be that big.

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Enjoy the music, not the equipment.