I've just got a 5.1 one concept speaker setup and only the front right and left are working the sub the center and the other two wont play audio they all work fine so its software issue i have realtek hd audio drivers to the latest version and i have all the same settings in both the windows sound properties and the realtek one its set to 5.1 speaker fill is eneabled and when i press the speaker icon for the center sub anmd back left and right speakers they dont run the test noise :S any ideas?