The only simple way I can think of to do this would be to connect the stereo analog output of the 47ai to an input on the 950 and use that input when listening through the TV's speakers. That should result in the 47ai downmixing for you. If you are using the 950's video switching as well, you would need to connect the stereo analog output from the 47ai to an audio input (tape or one of the aux's) and switch first to the DVD input before switching to the audio input - the 950's video switching "holds" the last video input used when an audio input is selected.