TommyBoy: I think I set the Width to 2, but don't remember rigth now. I also didn't like the default 0.
I'm still concerned that anything that hits the DSP will result in distorted spectrum and imaging. Try playing with the ToneDefeat on/off in stereo, note what it does, and then compare to what happens between stereo and DPLII. I think it is the same effect, but I'd like to hear different opinions. If I'm right it would mean that all surround modes, including DD and DTS and even DD 2.0, have distorted sound.