You don't want all channel stereo. Regardless of which 5.1 audio you select, you should be seeing either DD 5.1 or PCM 5.1 on your Onkyo's display.
Is it happening just with Stealth or do all your BDs playback with all channel stereo?
In your BD player's setup menu, are you certain that you aren't downmixing 5.1 to 2 channels? I think you need to double check your settings on your player and receiver. Something sure isn't right.
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