This is not a question concerning the differences between the various 6.1 channel formats (DD EX, DTS-ES discrete and matrix). I just want to know the correct settings on my Denon 3802 that will allow me to listen to these sources in the most ideal manner. From what I understand, the "matrix" setting (for back surround) is intended for all DD EX and DTS ES matrix encoded sources. What will happen if I listen to these sources in "non-matrix" mode? Will there be a degradation in sound quality? Also, and correct me if I'm wrong, the "non-matrix" setting for the back surround speaker is intended to be used for all NON-6.1 encoded sources (DD 5.1, DTS 5.1) that you wish to view in a simulated or forced 6.1 arrangement. And I understand that the results vary from soundtrack to soundtrack. And finally, if a DVD is DTS-ES discrete encoded, what is the setting? "Matrix" or "non-matrix"? Is there a difference, and does it matter? Essentially, if anyone can confirm the above info and answer my questions, please do. And if I've gotten something wrong in my interpretation of the settings, please let me know. Thanks.