Centre speaker is 42cm wide , 15cm high , and 17.5cm deep. Rear ported desigh so keep that in mind if you intend to wall mount it. I have it positioned below the tv on the stand - not ideal as it`s a little too low but some compromises have to be made!....... I placed two solid rubber wedges ( door stops actually ) to dampen vibrations , as the shelf is made from glass , and these also angle the speaker nicely upwards ( about 15 degrees ) towards the listening position.