It depends on whether the music source has a center channel in it or not. If there is center channel info, I prefer to play it rather than delete it or split it to the L/R speakers. If there isn't, the decision is moot.
Who turns center off when listening to music
Regarding 3.1 systems. When listening to music; Who deactivates the center channel via the processor?
And with surround systems who goes back to 2.1 when listening to music. Do any of the processors have presets you can you for this?