open the HD Audio Manager (control panel or it should pop up when you plug optical cable in)and click on the optical icon on the right click on default format tab and set it to 5.1. I also have the vizio sounbar do you have it set up for 5.1. should be a blue and orange light on sound bar( it is the one with the wireless sub?)
It is the one with the wireless sub. It came with the sound bar, wireless sub, and two satellite speakers that connect to the sub. I am not sure how to set it up for 5.1 sound? There is only an orange light on both the sound bar and sub to show that they are synced together.