Does your amplifier or receiver have any bass management? If not, you could get bass management by connecting your subwoofer via the LFE connection on the subwoofer and the sub out on the Ultra. Then you would turn sub out On on the Ultra. If you have a home theater receiver... 5.1, 7.2 etc... you can connect the subwoofer to your receiver subwoofer out and use its bass management which may be better than the bass management on the Ultra. If your receiver has pre out connections and you don't need bass management you can connect the pre-outs on your receiver to your subwoofer L & R RCA inputs. I would suggest trying different options. Turn off your subwoofer and your amplifier to change the connections is also my suggestion