A:
Absolutely. You can take a digital out from any other device that would otherwise feed your tv. For example if your cable box has a digital out. The caution though is that it would only then play sounds that come through cable. If you want it to always match what is on your tv and your tv has different inputs, then you will need to take the output from your tv.
Other than tv, the soundbar can play music or other sounds from your phone or laptop or other internet connected device. I have mine play streaming music from amazon while I am working in the office.