AFAIK you can't go unbalanced -> balanced with a simple adapter, so one of the three transports would have to have a balanced output.
Short of changing your components, you could connect your TV to the BADA via TOSlink and connect the Oppo and the cable box to the TV, but that would be a wasted use of your Oppo, unless you're just interested in it for the video quality.
Short of changing your components, you could connect your TV to the BADA via TOSlink and connect the Oppo and the cable box to the TV, but that would be a wasted use of your Oppo, unless you're just interested in it for the video quality.