A week or so ago I asked 990 owners if they got the same readings with the 990's auto setup as with an SPL meter, I did not have a meter at the time. Got an SPL meter today and ran through the calibration with the meter and here are the comparisons:

990 Auto Calibration

Left Frt. > 0
Center > -1
Right Frt. > +2
Right Rear > 0
Left Rear > +3
Sub > -2

SPL Meter Calibration

Left Frt.> 0
Center > 0
Right Frt.> +1
Right Rear > 0
Left Rear > +3
Sub > -6

So in my situation the Auto setup wasn't too far off but I feel better doing the calibration with the SPL meter.