You can do this by picking up the Bose wireless surround sound speakers that connect to your soundbar. You don't have to connect to the bar directly with cords, but you need a power source for the ...

Bose is introducing a clever new Personal Surround Sound feature that lets the company’s Ultra Open Earbuds pull double duty as rear speakers for its soundbars.

That said, Bose's wireless surround speakers for the Smart Soundbar cost $399, so you are saving $100. However, only you get the surround experience, not others who might be watching with you.