up late playing?
Go to surround menu
1) Check in the Quick menu and confirm that subwoofer says yes.
2) Check in the Normal menu and go to speaker setting. W/ M22's the front should be set to small and subwoofer should say yes.

It's possible you are set to large. If so, then some of the bass is actually sent to the fronts.

For my VTF2, I only have it turned to 1/4 (just about 8 o'clock, maybe 9). You shouldn't have to turn it higher, unless you want it boomy. The MCACC should adjust it accordingly.