Rick, welcome to the forum!
If I understood you correctly, you have the YSP1100 hooked up the the cable box and the cable box hooked up to the TV. However, I don't see where you have the YSP1100 hooked up to the TV. In order to view information from the YSP on your TV, you'll need to connect a video out signal from the YSP to a video in jack on the TV.
If you'll let us know how you have it all hooked up, including the audio signals, we should be able to help you out - including your subwoofer question.
Adam