Many reasons for a center channel. Primarily they 'anchor' the soundstage or Dialogue for the listeners in the room. Anyone who is slightly offset from the pure middle of 2 speakers will start getting very skewed sound cues that would not work well in movies.
I actually use multichannel up conversions, like TriField even for 2ch sources, as they are much more pleasing (in a well setup system).
Read more here: http://stereophile.com/reference/407upward/
I actually use multichannel up conversions, like TriField even for 2ch sources, as they are much more pleasing (in a well setup system).
Read more here: http://stereophile.com/reference/407upward/