I was searching in amazon for cables. When I searched for subwoofer cables I found a long RCA cable with a Y splitter. I was confused because of the multiple inputs and outputs on the subwoofer. I guess I need to connect the subwoofer cable to SW1 and then to the Y cable which goes into L&R in of the subwoofer. Such complexity should have been replaced by one cable that goes into Subwoofer IN.
With your post I was able to figure out what goes where. Thanks!