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Originally Posted by Groucho2004
Picking up on that once more - I don't have a surround setup (and probably never will), just a plain stereo system. In this case I should always use "-downStereo", right?
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Yes.
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Also, if I downmix DTS tracks, should I use the "phaseshift" option or does the downmix algorithm take care of that? How can I even determine if the back channels have a phase shift?
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This is a old question.
A correct 5.1, no matter if is AC3 or DTS, must have surround channels already "phaseshifted" over same info in front channels, by soft or when are recorded with microphones at different places, if you do a new "phaseshift" you can finish with 180º than convert the mathematical "+", in mix functions, in a "-" and cancel many info.
Like you don't know how the 5.1 was generated my recommendation is don't use "phaseshift", most the times is the correct way. And only try "phaseshift" when the previous mix sounds strange.