Is it a JVC tv? I'm thinking marry up the tv and the sound bar first without the Virgin box plugged in (use tv aerial input)...select "antenna" from input options. Check sounds bar works. Keep the tv on. Unplug the aerial. On input options select "cable" or might be Virgin box as an option. Plug in the Virgin box, turn on Virgin box. That might trick the tv/soundbar into picking up the sound off the Virgin box. If not....try each audio input option on settings in turn. The option to plug the soundbar into the Virgin box direct.....not sure about that. Doesn't sound like the wiring option is a goer. Good luck.