A:Answer The short answer is, they can't.
Surround sound systems are designed to play 5.1 audio. The 5 represents 5 separate channels ( left front, center front, right front, right rear, and left rear). The show you're watching will have the audio intended for each channel encoded in the show itself. The sound bar is not capable of re-writing the audio signal to send audio meant for the front speakers through the rear speakers.