I have the Logitech Z-5500 speakers and am trying to make my onboard sound play in a 5.1 setting, but all I am getting is sound from the front speakers and nothing from the rear, centre or sub! I have chosen the 6CH Speaker setting in the Realtek HD Audio Manager, the analogue settings are correct but I am still not getting anything then 2CH sound. 
Any and all suggestions are much appreciated!
Cheers
Tom
PS Not sure if I should have posted this here or in the Sound City forum, if its wrong please fell free to move it!

Any and all suggestions are much appreciated!
Cheers
Tom
PS Not sure if I should have posted this here or in the Sound City forum, if its wrong please fell free to move it!