I'm confused. So your Kenwood reciever is only getting left/right signal from the Sony TV which is decoding DD from cable? So when you're watching TV, you should only be getting sound from the right and left speakers, no? If you're getting them from everything, the receiver must be doing some sort of surround processing, such as Dolby Pro Logic. It can't be doing Dolby Digital, because there's no digital connection from the cable to the receiver, right?

I am the Doctor, and THIS... is my SPOON!