The centre speaker (also known as a dialogue speaker) is installed directly above or below the screen and will carry the vast majority of the dialogue from any AV content as well as other important parts of the soundtrack. It should not be confused with a Soundbar, which is usually an all-in-one solution incompatible with a home cinema system.
In theory any speaker is capable of reproducing this audio information however there are many bespoke designs available. Making sure this offers a good tonal match to the front speakers is very important.
If you need any help with choosing the right centre speakers, want to know more or even need help putting together a project, feel free to give us a call on 03456 803 802 for free expert advice.