While Beosound/Beovision Theatre features seven built-in channels (centre, left front, right front, left front up-firing, right front up-firing, left front side-firing and right front side-firing), it is also possible to connect to eight wired speakers using Power Link, eight speakers using Wireless Power Link, and 4 using Digital Power Link*.
See How do I add speakers to Beosound/Beovision Theatre?
*From software version 4.1.1
