For Cirrus Extra Surround, Pro Logic II, and NEO:6, there are both "C" and "M" modes for "cinema" and "music" -- the idea being that "C" is better suited for movies and "M" better suited for music. There is likely some personal preference involved, but in general I've stuck to "C" for movies and TV and been fairly pleased. I haven't used any of those modes much at all for music, but did recently tinker with it a little and felt like I could hear some benefit to the "M" mode.

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