Hi Leena.
Thanks for posting on the forum!
Where is your AV cable from your xbox going into? What type of ActivBoard and system do you have?
The projector won't produce sound from the unit directly, however do you have an ActivBoard with speakers built in?
If possible, please could you perhaps take a photo of the set up you have?
I look forward to your reply.
(Case 00395867)
Adam
Promethean Technical Support