dCS stack with ML Descent

Any body having problem in Driving ML Descent subwoofer with dCS stack? I've recently hooked up dCS stack with C2200 and am experiencing weak action by Descent which functions fine with all other sources such as record, tape ,tuner and other CD player. The main speakers are ML Summit which seem working normally. The power amp is MC2102. I'm using an XLR cable to connect Elgar and C2200. Please help.

Sam