Ok im not a av wizard so need some advice. i have a full house with sonos played through systemline ceiling speakers in each zone. The Sonos is plugged into a wall input socket in each room. i am having a full new cinema system in my lounge and would like to play sonos through the speakers on the cinema system and add the systemline speakers as my back speakers to the home cinema system. If i plug the sonos into the av as an input and then plug and output from the av to wall panel for the systemline speakers will this work. I have read up about the works with sonos products but do i need this.