I think my NAD T752 Receiver might be defective. The problem: When using a two-channel stereo source, the only listening modes available to me are "Stereo", "Dolby PL", "Dolby PL II", "DTS Neo:6 Movie", and "DTS Neo:6 Music". I do not have access to "Downmix", "EARS", "Matrix 7.1", "Enhanced Stereo 1 (ST1)", or "Enhanced Stereo 2 (ST2)". According to the manual, all of these modes should be available when using a two-channel stereo source. The sources that I have tried include two-channel analog stereo connections from a Direct TV receiver, and also a CD player. Same issue when listening to a standard CD through a universal player, which is hooked up via digital optical input. When the universal player is outputting a digital bitstream, the receiver works as it should and automatically selects the proper listening mode (Dolby Digital, etc). I have tried unplugging the receiver to reset the microprocessor, but this has no effect. I only have mains, a center, and a sub connected. No surrounds, yet. Any ideas what might be going on here? Am I misunderstanding the manual?

Manual can be seen here: NAD T752
Listening Modes are addressed on pages 20-21.

Thanks in advance.