Facing TV Problems? Ask a TV Technician.
Hello and welcome to JustAnswer, I look forward to assisting you today. It is going to depend on the TV. You can try connecting it to the component (RCA) audio out, but that may disable the internal speakers. If that doesn't disable the internal speakers it will work with one exception. That is a line level signal so your volume control will have no effect on the sub. You would need to manually turn it up or down to match the volume of the TV.