I have the 3802 and for me it gives the option of using either those amps as either backs or as fronts for a second system. Hit the menu button on the remote and look through the options that are displayed on your TV. Another thing that I would suggest is that you use DTS-ES material as i'm not sure how its decoded when its just regular DTS or DD.
I don't know if this will help... if not I think that there are some guys here who do have that exact model.