Sorry. Yeah, turn the gain/volume down on the sub. That will in turn raise the subwoofer pre-out level on the receiver and MCACC will continue to give you a closer reading approaching 0. Really, the numbers are arbitrary but what one thing you want to avoid is running the subwoofer pre-out at either extreme or "hot" like at a +4 and beyond.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne