I have just purchased the above sound bar and installed it using a digital optical cable and have positioned it under my Samsung TV. Set the TV to external speaker and to Optical out PCM.

The sound comes through the bar OK and then I press surround and get an echo as if everyone is in a cave. I have changed as many settings as I can and this is always the same. I thought this would give me virtual surround and not someone in a cave.
Can you help and advise me on this?