Maybe so, but my suggestion would be to use the Audyssey calibration and if the setting for the M60s is other than "Small" with an 80Hz crossover, manually change the results to that. The M60s should never be set "Large" and the "+Mains" sub setting shouldn't be used, just "LFE". You're working the M60s and 989 harder than you have to, instead of letting that fine sub take the lowest bass load off of them. The -11.5 calibration result for the sub indicates that the level setting on the sub amp itself should be turned a bit lower so that the calibration comes out closer to 0.
