Centre Speakers constitute a very important part of the surround sound experience; they deliver the dialogue and detail. In a serious Home Cinema system, it is the centre channel which takes the system beyond the realms of purely stereo television. It is the centre channel monitor that localises dialogue to the screen, the effect of which is most notable with off centre viewing.
This puts them quite literally at the centre of the action. Finding the right centre speaker for you is a key part to building a great home cinema.