You can reset the SoundBar's audio setting back to the defaults. To complete this you will need the remote to the SoundBar.

Once you have the remote please press the follow buttons: BASS+, VOL-, and TREBLE+. Please press these in that order and within 3 seconds.

The SoundBar will automatically turn off and back on again. The sound settings are now set to default.

The picture below shows the remote and the order the buttons need to be pressed.