i'm having trouble getting my subwoofer dialed in correctly.. it's always way to loud coming out of the 990.

In most cases and with my old Marantz receiver.. i could set the sub level on the back of the subwoofer to about 9 or 10 O'clock. Now with the 990, the highest I can set it without damaging the sub is to about 7 O'clock.. with 6 O'clock being no output. ANyone know why my sub seems to sensitive now? I have played around with the X-over and the phase.. but it's still to loud.