I've had the HD-D1 hddvd player since launch hooked up to my 990/7125. I have the rear channels split as mentioned above thru the analog outputs. It sounds better to me that way so I would say get some Y-adapters and give it a try. The Dolby Digital Plus sound thru analog is awesome! I watched The Chronicles of Riddick and Pitch Black this week and they were just exceptional in both picture and sound!
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***dvdguru***
My system:
Outlaw 990/Outlaw 7125
Panasonic TH50PHD7UY HD Plasma
Toshiba HD-XA2 HdDvd Player
Panasonic BD-10 BluRay Player
Paradigm Studio 60 v.3
Paradigm CC690 Center v.4
Paradigm ADP470 Side & rear surrounds
SVS PB12 Plus/2 Sub