I have logitech 6.1 speakers when I go to advanced speaker settings on the control panel on the list of speakers I can only chose 5.1 or 7.1, with both of these the centre rear speaker doesn't play sound. Its connected fine so thats not the problem. Is there an extra download I can get so that I can select 6.1 speakers on the advanced speaker settings list or is there something else I can do to make the last speaker work? I appreciate all help, thanks!