The "Phantom" mode works pretty well for "2 channel music" and utilizes the surrounds (not center). On Some material the phantom mode tightens up the mix by seeming to use the subwoofer more "deliberately". This is especially true for very fast double bass drumming. It also seems to extend the frequency range a very small amount, however the trade off is an increase in "fatique" and a decrease in "warmth".
I'm not a fan of any of the other DSP modes, which typically add in some delay.
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"Art is not a mirror, but a hammer."
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"Art is not a mirror, but a hammer."