Hi,
Thanks for posting on the forums.
How are you trying to connect to the TV's?
What projector model do you have?
Do you have any connection panels or wall boxes connected with your ActivBoard at all? If so, please could you provide a photo of this so we can see what connections are available?
It is possible to connect your projector to a TV box depending on the outputs on the projector. However Sound will not come from the projector and will need to be somehow connected to the 300PRO speakers using a audio cable.
I hope this helps.
Adam
Promethean Technical Support
(Case 00420867)