What Mark said. A 5.1 channel system like that could only be used by a desktop with 5.1 analog outputs. If the only option you have is the headphone jack, then 2.0 is the best you’re going to get. You’ll be using either the TV or AUX inputs. If you don’t get a signal to the sub with those inputs, then that’s probably just the way it is
Regards,
Wayne A. Pflughaupt